Will COVID-19 Threaten the Survival of the Airline Industry?

: The pandemic causes social distancing and lockdown, which impedes consumer conﬁdence and contracts the economy. Hence, this study analyzes the corona (COVID-19) impact on the airline industry revenues (ALR) and forecast by the vector autoregression (VAR) method. The results indicate that gross domestic product (GDP) and air cargo are the best predictors of ALR. The forecasting outcomes explore if ALR will decline and expect to back to pre-COVID-19 in 2023. Our results resemble both the V-shaped and U-shaped, which suggests slow gradual recovery with longer lockdown and border disclosure. The government can restore conﬁdence building by providing economic stimulus packages and can encourage the airline to return to travel. Furthermore, softening the passenger rules concerning the refund of unﬂown ticket, reducing taxes, and reducing overﬂight taxes, all reduce the costs. Similarly, the mutually recognized global standards are crucial for effective execution, and any temporary measures taken by the government should have a clear exit strategy. The study major limitation includes the lack of relevant research and data availability.


Introduction
The world is in the midst of the corona (COVID- 19) shock, which is a dark time in history, causing significant economic implications for all segments of the economy [1]. Discussion of COVID-19 impact has become extremely important for policymakers. The pandemic has a great cost: bringing death, economic destruction, and changing every aspect of society. It is strangling the global economy, leading to layoffs, a tourism crisis, consumer spending, and plunging oil prices [2]. Similarly, the pandemic has changed consumer spending, unemployment, and the cost of living. It is predicted that economic growth will remain weak and dependent on government stimulus packages. Moreover, blockade and other measures have dampened consumer confidence and destroyed perishable products. The extent of effects is unknown, and severity varies from country to country, as it affects some areas more than others. The challenge is bigger than expected, and the situation will become clear at the end of the pandemic. However, it is extremely difficult to assess the comprehensive impact of the pandemic at the present point, which focuses on disease control.
The airline industry remains very fragile and one of the biggest casualties of the global COVID-19 pandemic [1][2][3]. Air traffic declines because of social isolation, and travel restrictions have grounded two-thirds of commercial airlines and deteriorate airline industry revenues (ARL). It is the worst kind of unrest, as 7.5 million flights are cancelled; customers demand refunds with no reservations. This is unprecedented in aviation history, and the greatest challenge when more planes are on the ground than in the air. The pandemic has disrupted the economy and hit tourism, which has led to ALR reduction and business model will change in the long term. Goslings [14] finds that COVID-19 has grounded their fleets and halted long-haul destinations, and many have gone bankrupt. Sun et al. [3] evaluate the COVID-19 impact on the global airline industry and conclude that aviation is suffering the most. It shows that airline response was delayed, which has provided an opportunity to spread the pandemic at the global level. Nižetić [15] explains that many restrictions have affected the airline industry in Europe. It declines the number of flights and air cargo in the region. Agrawal [16] expresses that the pandemic has disrupted and threatened the airline industry because of lockdowns, and weak tourism condensed income. The industry is vulnerable to oil prices and monetary shocks and declining currency. Monmousseau et al. [17] study the influence of travel restriction due to COVID-19 on the U.S. air industry. The results show different airline has responded differently to COVID-19 from the passengers' perspective.
Lau et al. [18] investigate the air traffic volume and COVID-19 and confirm a strong connection between the domestic case and passenger volume. Similarly, the relationship is significant between international COVID-19 cases and passengers' volume, Budd et al. [19]. Rahman et al. [20] find that global airline revenues are projected to decline because of the COVID-19 decline in demand flights in Europe. The border closure by the governments resulted in disappeared passengers which altered the flight operation and reducing the staff 113 billion. Moreover, the pandemic has affected the air freight business due to flight cancellations. Li [21] analyzes the COVID-19 effect on China's civil aviation and concludes that the air cargo outlook is optimistic. The air cargo sector can recover easily as compared to passenger transport. Serrano and Kazda [22] show that pandemic has restricted traveling, which has affected aviation badly, and airlines have ceased flights. However, the recovery can be expected at a slower rate, as V-shape and U-shape depend on the economic outlook. McKibbin and Fernando [1] confirm that the pandemic outbreak has significantly affected air transport. They show that the pandemic has far-reaching effects on the economy, interrupts production, and limited transport has further slowed down economic activities. Brauer and Dunne [23] show a decline in the international passengers' traffic and ALR during 2002-2003, and the most palpable reasons are terrorist attacks, the Iraq war in 2003, and the spread of severe acute respiratory syndrome (SARS). Suau-Sanchez et al. [24] find that the airline industry is one of the hardest hit by the pandemic, which will change the aviation industry. This unexpected crisis is putting airlines under unprecedented strain. The COVID-19 pandemic is not only squeezed the airline industry but also disrupts the economic activities that considerably influence air transport demand and ALR. Bal and Varol [25] suggest that the airline industry plays a contributing role in the employment and trades between countries that are experiencing a crisis because of the COVID-19 outbreak. It has wiped out business, customers' plan and restrictions on free travel, which has devastated the airline industry and ALR around the world.
The above literature related to the COVID-19 pandemic and its impact on the airline industry can be summarized in the following ways. First, as the pandemic crisis is evolving, it is uncertain when the calamity will end. Thus, the current literature has no adequate studies which shed light on pandemic shocks and their impact on the airline industry revenues. Second, the current literature about this topic lacks data testing and considering the other contributing factors such as economic policy uncertainty, exchange rate, oil prices, air cargo, and tourism. Third, the existing studies do not include research on future forecasting about the airline industry in the response of COVID-19. As the situation is still ongoing and will take time to recover. The postpandemic condition will turn out more difficult, which needs to be forecasted. Thus, this study attempts to cover the gap between the previous studies and the current ones and provide comprehensive knowledge about the future scenario. It considers the main macroeconomic determinants of the airline revenues and forecast. This can help in the proactive policy formulation in the postpandemic period. Our sample comprises major countries around the world. Thus, our study is extremely important to answer such questions regarding the airline industry's response to the pandemic.

Scenario Analysis and Methodology
Some argue the COVID-19 shock and its contributing factors affect the airlines industry. The Boston Consulting Group (BCG) [26] presents several scenarios about the airline industry recovery in the postpandemic situation when demand recovers from the highly uncertain future [27]. First, the V-shaped scenario implies rapid recovery, which can take 3-6 months, with the virus being contained and fresh cases dropping rapidly, and the government possibly taking effective policies to contain the virus, and the economic activities recover. Leisure and businesses bounce back quickly, which has a positive impact on the airline industry. Second, the U-shaped situation means that recovery is a slow, gradual decrease in new cases. The lockdown can be longer, and there can be border disclosure and visa restrictions. Third, a prolonged U-shaped recovery suggests a slow gradual recovery that may take 12-18 months, as well as the slow decrease in new cases with longer lockdown and border disclosure. Fourth, L-shaped structural changes take 12 months to stabilize the economic activities and to reopen the border and relaxation of visa. Last, the W-shaped shows a rapid decrease in the virus followed by a rapid increase. The reemergence of a pandemic takes 12-18 months for recovery in the medium run. The finding suggests both V-shaped and the U-shaped recovery of the airline industry in these countries because of the gradual decrease in fresh cases and deaths. The lockdown can be longer, and there can be border disclosure and visa restrictions.
We use the VAR to analyze the pandemic impact and forecasting. The model provides more accurate forecast results as compared to the simple and general linear statistical model [28]. The VAR model is closer to economic reality because of its explanatory and exogenous variables interactions. The model may offer more accurate forecasting results by considering the components simultaneously and including fewer lags. Compared to structural simultaneous equations, the VAR does not require prior and "arbitrary" constraints to ensure identification [29]. There are several endogenous variables such as economic policy uncertainty, exchange rate, economic growth, oil prices, tourist arrival, and air cargo that can play a contributing role relationship between COVID-19 shock and ALR. We have used the following steps in building the VAR model. First, statistic M (i) and the Akaike information criterion (AIC) have been used to identify the order and then estimate the specified model by using the least-squares method (if parameters statistically insignificant, reestimate model by removing these parameters), and finally use the Q k (m) statistic of the residuals to check the adequacy of a fitted model. The vector autoregression model (VAR) is a multivariate time series model used for forecasting. The first-order VAR (1) model is given below; where R t is a k by 1 vector of variables. The bivariate case is simply where R 1,t , and R 2,t in VAR are contemporaneously related by their covariance σ 12 = σ 21 .
The AR and VAR modelling methods depend on the lagged values and are, therefore, very useful for forecasting. Thus, the classical form of the VAR model is represented as follows: We obtain the forecasting results using the VAR (1) model.
We can obtain forecasting for more than one period as follows: To find out the best predictor, we run each variable with dependent variables, and the highest value of R 2 helps in deciding the best predictors for ALR. The outcomes in Table 2 confirm that GDP and air transport freight are the best predictors of ALR based on said criteria. Therefore, this study predicted ALR values based on lagged values of ALR, GDP, and air transport freight.
The fixed effects (FE) method is suitable for analyzing the influence of time-varying variables. It explores the relationship between predictor and outcome variables in an entity. Each entity has its characteristics, which may or may not affect the predictor variables. The FE approach assumes that the outcome can deviate due to bias predictors which need to be controlled. However, the random effect assumes that the error term of the entity is not correlated with the predictor variable, which allows time-invariant variables to serve as explanatory variables.
The panel fixed effect is based on Equation (1), while we test the random effect using Equation (8).
where EXR is the exchange rate, OP denotes oil prices, TA expresses tourist arrival, and AC is air cargo. Similarly, υ it and ε it are between and within entity error. This estimates the forecasting results from 2020 to 2023 in the major economies of the world. Thus, these countries are most affected by COVID-19, and forecasting is highly recommended for the future outlook which can help in devising effective policies by the various stakeholders in the airline industry.

Data
This study was undertaken to assess the COVID-19 shock influence on the airline industry in Australia, Brazil, Canada, China, France, Germany, Italy, India, South Korea, Japan, Netherlands, Spain, Russia, the UK, and the USA. The sample period is from 1998 to 2019, which was retrieved from the world development indicators database (WDI). Table 1 highlights the summary statistics of these countries. The USA recorded the highest mean value for the ALR followed by Japan, Germany, and France, implying that aviation is a big industry in these countries and contributes to economic activity. However, China had the highest GDP rate followed by India, respectively, implying that both emerging and populous countries are important contributors to the airline industry. It recorded the highest standard deviation of ALR for China, followed by the USA The skewness values are positive for all countries except France and Germany. The kurtosis values of the GDP rate for all the countries are greater than 3, which is labelled as a leptokurtic distribution, suggesting higher volatility. Likewise, the kurtosis values of tourism arrival for most of the countries are leptokurtic distribution, and the remaining countries are the platykurtic distribution and representing less instability. All variables are normally distributed according to the Jarque-Bera test, but the GDP rate is non-normally distributed. Notes: ALR: shows airlines revenues, GDP indicates economic growth; AC represents air cargo. *** denote significance at the 1% levels. Table 2 highlights the VAR model results and reveals that economic growth, economic policy uncertainty, and air cargo have a positive impact on ALR in these countries. The results are like the work of Baltaci et al. [30], which states that ALR and economic growth have a strong correlation. It is well established that economic activities play an important role in consumption, international trade, tourism, and oil prices, which ultimately reflects in the higher air transport demand [31,32]. These countries observe greater economic activities, trade, and tourism [7] which are the effective factors to describe airline transport and their revenue pattern. In the same way, the rising economic uncertainty has a significant impact on the macroeconomic variables, which have a profound effect on economic activities [33,34] and can cause a large swing to ALR. The 9/11 terrorist attacks increase the uncertainty level and security concerns, which make air travel difficult and time consuming. The air travel demand declined, and the industry recorded a decreasing trend because of the increasing geopolitical uncertainty that is replicated in the falling ARL [35,36]. The economic uncertainty is at the highest level during the financial crisis in 2008 because of stagnant economic activities and dwindling tourism and international business travel. Tourism plays a greater role in economic growth and job creation in these countries, which are sensitive to economic and political uncertainties, creating a fear factor that influences decision making [21,[37][38][39][40][41][42]. These countries are the top destinations of tourism, and substantial tourist arrival is the major contributor to ALR and economic activities. The prevailing condition has considerably declined tourism due to low disposable income, which in the end drops the passenger demand and ALR. These countries' citizens are the most passionate travelers that have pushed the passenger demand up because of stable economic growth. However, the pandemic has paused tourism in these countries because of social distancing and visa restrictions that influence the air travel industry. The recession cuts the business travel by the companies to reduce their cost and keep the liquidity, which is reflected in the falling ARL [43,44]. Standard errors in parentheses. * p < 0.05, ** p < 0.01, and *** p < 0.001.

Vector Autoregression Model
However, the finding reveals that oil prices and exchange rates have a negative effect on ALR [45]. Fuel prices are the largest cost in airlines, and rising oil prices slash ALR. It has suffered economic crises related to oil prices and stagnation produced by pandemic war and security threats. Similarly, air cargo is one of the main contributors to ALR and is expected to be a bright spot for airlines in 2020. The decline in passenger demand pushes the air cargo up, which can contribute a significant portion to the revenues and substantially reduce their losses [46]. The economic slowdown results in the decline of trade, which negatively affects air cargo. However, air cargo is efficiently used for medical supplies and relief goods during the peak of the pandemic, which can minimize the overall loss of the airlines. The exchange rate has a negative impact, which implies that ALR decreases with rising fluctuation in EXR [47,48]. The exchange rate risk is extremely critical because of the globalization of the airline market and affects the operating profit in the competitive global market.

Forecasting Results
We use GDP and AC to create a VAR (1) model of ALR forecasting. Thus, the study forecasts COVID-19 shock on ALR until 2023 through the VAR model. Table 3 reveals that GDP and air cargo are the best predictors for ALR in these countries. It implies that economic growth and ALR are strongly correlated because of their contribution to Sustainability 2021, 13, 11666 8 of 18 employment, adding value to the economy, and enabling trade. The higher economic activity enables a conducive environment, higher income per capita, boosting tourism, and business [49], which turns into higher traveling and ALR. Air cargo is one of the primary sources of ALR, which declines because of the economic slowdown. Air cargo demand increases because of restrictions on the passenger's flights, which are used for medical supplies and relief goods during a pandemic and minimizes the overall loss of the airlines [46]. Standard errors in parentheses. * p < 0.05, ** p < 0.01, and *** p < 0.001. Figure 1 illustrates the forecasting results. It shows that Australia's national carrier revenues are devastated because of the collapse of global air travel. It is expected that the airline will receive smaller revenues in the next three years, which can make it hard to survive. The forecasting results are in line with the V-shaped recovery scenario in these countries, signifying that the virus will be contained by effective policies and the economic activities recover. The Brazilian airline industry depends on domestic demand, which declined by 52.7% because of the pandemic. However, the industry is in a better position because of COVID-19 shocks. The forecasting results show that recovery will be quick with substantial support from the government. The pandemic pushes the Canadian government to support the airline industry's survival. The ARL will decline by 43.2%, risking 250,000 jobs and $25.4 billion to GDP, and the recovery scenario is V-shaped. The airline industry in China suffers a colossal financial impact because of COVID-19. However, the country has largely recovered from the epidemic, but the number of passengers are below the pre-COVID-19 level. According to the Civil Aviation Administration of China (CAAC) that passenger drops by 48.5% and 33.62-billion-yuan ALR in the first quarter of 2020. The forecasting result presents a V-shaped recovery from 2021 onward. Appendix A illustrates the robustness results. Figure 2 displays the forecasting results for France, Germany, India, and Italy. The result shows that India is one of the largest aviation markets in the world, which has been severely affected by the pandemic outbreak. The passengers demand contracted by 49% in India, revenues declined by 11.6%, and recovery can be V-shaped. The COVID-19 shock suppresses the economic growth in France and GDP per capita drop by 6.73% in 2020. The travel ban sternly affects the tourism sector, which has a significant contribution to ALR. The pandemic will reduce the number of passengers by 80 million, a revenue loss of $14.3 billion, endangering 392,500 jobs, and $35.2 billion to GDP. The forecast results imply that the airline industry may recover and support a U-shaped scenario, in which the virus will be contained gradually and new cases will drop slowly. 250,000 jobs and $25.4 billion to GDP, and the recovery scenario is V-shaped. The airline industry in China suffers a colossal financial impact because of COVID-19. However, the country has largely recovered from the epidemic, but the number of passengers are below the pre-COVID-19 level. According to the Civil Aviation Administration of China (CAAC) that passenger drops by 48.5% and 33.62-billion-yuan ALR in the first quarter of 2020. The forecasting result presents a V-shaped recovery from 2021 onward. Appendix A illustrates the robustness results.  Figure 2 displays the forecasting results for France, Germany, India, and Italy. The result shows that India is one of the largest aviation markets in the world, which has been severely affected by the pandemic outbreak. The passengers demand contracted by 49% in India, revenues declined by 11.6%, and recovery can be V-shaped. The COVID-19 shock suppresses the economic growth in France and GDP per capita drop by 6.73% in 2020. The travel ban sternly affects the tourism sector, which has a significant contribution to ALR. The pandemic will reduce the number of passengers by 80 million, a revenue loss of $14.3 billion, endangering 392,500 jobs, and $35.2 billion to GDP. The forecast results imply that the airline industry may recover and support a U-shaped scenario, in which the virus will be contained gradually and new cases will drop slowly.
In the case of Germany, the epidemic shock affects all sectors and shrinks the economic growth, and GDP per capita will decline by 6.55% in 2020 [50]. It leads to travel restrictions and will drop international and domestic travel during 2020. The declining trends will continue in 2021 because of the fear and economic downfall, which ultimately is reflected in the failure of ALR. It will reduce the number of passengers by 103 million, lost 17.9 billion dollars, endangered 483,600 jobs, and caused $34 billion in economic losses [4]. The forecasting values show that recovery will take the V-shaped course. The lifeline of the airlines depends on government supports, which ultimately offers the help of $10 billion to airlines in Germany. Similarly, Italy is the first country in Europe that is im- mersed in the pandemic outbreak and goes into lockdown, which leads to paralyzing economic activities. According to the IATA, the number of passengers dropped by 83 million, resulting in a loss of income of $11.5 billion and risking 310,400 jobs and $21.1 billion of the GDP. The forecast outcomes infer that the airline industry will recover, which supports a U-shaped scenario.  Figure 3 shows the forecasting results of Japan, the Netherlands, Russia, and South Korea. It shows that Japan receives a huge number of visitors from China, South Korea, Malaysia, Hong Kong, and Taiwan-most affected by the pandemic which has squeezed ARL [42,51]. In the case of the Netherlands, the finding of the forecasting shows the Ushaped scenario, implying that the effect of the pandemic will exist in the long term and normalcy will prevail until 2021. The spread of the COVID-19 has a negative impact on tourist flow, and the air travel market can experience one of its largest declines in Russia. Furthermore, rubble depreciation worsens the situation and may restrict international transportation. The forecasting results show that ALR will decrease until 2020-2021, and recovery can start afterwards. The results are in line with the prolonged U-shaped scenario, which suggests a slow gradual recovery that may take 12-18 months and a slow decrease in fresh cases with longer lockdown and border disclosure. Likewise, the South In the case of Germany, the epidemic shock affects all sectors and shrinks the economic growth, and GDP per capita will decline by 6.55% in 2020 [50]. It leads to travel restrictions and will drop international and domestic travel during 2020. The declining trends will continue in 2021 because of the fear and economic downfall, which ultimately is reflected in the failure of ALR. It will reduce the number of passengers by 103 million, lost 17.9 billion dollars, endangered 483,600 jobs, and caused $34 billion in economic losses [4].
The forecasting values show that recovery will take the V-shaped course. The lifeline of the airlines depends on government supports, which ultimately offers the help of $10 billion to airlines in Germany. Similarly, Italy is the first country in Europe that is immersed in the pandemic outbreak and goes into lockdown, which leads to paralyzing economic activities. According to the IATA, the number of passengers dropped by 83 million, resulting in a loss of income of $11.5 billion and risking 310,400 jobs and $21.1 billion of the GDP. The forecast outcomes infer that the airline industry will recover, which supports a U-shaped scenario. Figure 3 shows the forecasting results of Japan, the Netherlands, Russia, and South Korea. It shows that Japan receives a huge number of visitors from China, South Korea, Malaysia, Hong Kong, and Taiwan-most affected by the pandemic which has squeezed ARL [42,51]. In the case of the Netherlands, the finding of the forecasting shows the Ushaped scenario, implying that the effect of the pandemic will exist in the long term and normalcy will prevail until 2021. The spread of the COVID-19 has a negative impact on tourist flow, and the air travel market can experience one of its largest declines in Russia. Furthermore, rubble depreciation worsens the situation and may restrict international transportation. The forecasting results show that ALR will decrease until 2020-2021, and recovery can start afterwards. The results are in line with the prolonged U-shaped scenario, which suggests a slow gradual recovery that may take 12-18 months and a slow decrease in fresh cases with longer lockdown and border disclosure. Likewise, the South Korean airline industry witnessed a decreasing trend in passenger revenues by 29.5% because of a fall in demand, and the future outlook can be a gradual recovery and easing the travel restrictions [42].   Figure 4 exhibits the forecasting results for Spain, the UK, and the USA The pandemic reduces the economic activity, which has a significant impact on the consumer spending pattern in Spain and eventually contracts ALR. It is one of the biggest tourist destinations which contributes a substantial portion of 14.9% to the GDP. The COVID-19 shrinks' tourism, which results in the decline of ALR because of the interconnection between transportation and tourism. According to IATA, 114 million fewer passengers will cost $15.5 billion in revenues, 901,300 jobs, and a $59.4 billion loss to the economy. The forecast results suggest that the airline industry may recover and support a U-shaped scenario; therefore, recovery is a slow, gradual decrease in new cases and deaths.
Because of the pandemic, the number of passengers landing in the UK has dropped sharply, resulting in a loss of $26.1 billion in income, putting nearly 661,200 jobs at risk, and approximately $50.3 billion loss to GDP. As compared to the same month in 2019, the passenger's arrivals declined by 99%. International business travel has halted, which is an important economic driver, and fewer planes have resulted in reducing ALR. The figure shows ALR will decline in 2020 and recover afterwards, which supports the U-shaped  Figure 4 exhibits the forecasting results for Spain, the UK, and the USA The pandemic reduces the economic activity, which has a significant impact on the consumer spending pattern in Spain and eventually contracts ALR. It is one of the biggest tourist destinations which contributes a substantial portion of 14.9% to the GDP. The COVID-19 shrinks' tourism, which results in the decline of ALR because of the interconnection between transportation and tourism. According to IATA, 114 million fewer passengers will cost $15.5 billion in revenues, 901,300 jobs, and a $59.4 billion loss to the economy. The forecast results suggest that the airline industry may recover and support a U-shaped scenario; therefore, recovery is a slow, gradual decrease in new cases and deaths.

Conclusions
This study examines COVID-19 impact on the airline industry and forecasts by using the VAR model. The results show that GDP and air cargo are the best predictors of the airline industry. Similarly, economic growth, economic uncertainty, and air cargo have positive effects on ALR. However, oil prices and exchange rates have a negative impact on ALR. Likewise, the forecasting outcomes reveal that ALR will decline until 2020-2021 and recover subsequently, and the result supports the V-shaped and U-shaped recovery scenarios in these countries. The study offers useful policy implications for the airline industry. First, the government can restore confidence building by providing economic stimulus packages that can encourage the airline to return to travel and ensure safety. Furthermore, softening the passenger rules regarding the refund of the unflown tickets, reducing taxes and reducing overflight taxes, decreases the costs and can lift the industry. Second, to ease the repayment conditions of cancelled flights, regulatory relief is also crucial to both the airline industry and the passengers. It can help to restore customer confidence and the industry to return to the skies. Similarly, mutual recognition of global standards is important for effective application, and any temporary measures taken by the government should have a clear exit strategy. Last, air traffic experiences a huge impediment due to quarantine measures, and the majority cannot travel if it is in place. Thus, the governments of these countries need an alternative coordinated strategy consistent with health measures to manage air travel in COVID-19 and make the industry functional and safe for traveling. This study can be extended in future to evaluate the impact of lockdown and restrictions on the airlines passenger numbers and revenues. Moreover, the study can be expanded to analyze various airlines and their overall management during the pandemic.  Because of the pandemic, the number of passengers landing in the UK has dropped sharply, resulting in a loss of $26.1 billion in income, putting nearly 661,200 jobs at risk, and approximately $50.3 billion loss to GDP. As compared to the same month in 2019, the passenger's arrivals declined by 99%. International business travel has halted, which is an important economic driver, and fewer planes have resulted in reducing ALR. The figure shows ALR will decline in 2020 and recover afterwards, which supports the U-shaped scenario. The U.S. is the most affected country by COVID-19, and it forecasts the economic loss to be equivalent to $519 billion, which reflects an aggregate $1.2b trillion contraction in total economic effect. The country's travel industry was heavily affected by COVID-19 and a decline of 81% in revenues. The findings of the forecasting express a V-shaped recovery.

Conclusions
This study examines COVID-19 impact on the airline industry and forecasts by using the VAR model. The results show that GDP and air cargo are the best predictors of the airline industry. Similarly, economic growth, economic uncertainty, and air cargo have positive effects on ALR. However, oil prices and exchange rates have a negative impact on ALR. Likewise, the forecasting outcomes reveal that ALR will decline until 2020-2021 and recover subsequently, and the result supports the V-shaped and U-shaped recovery scenarios in these countries. The study offers useful policy implications for the airline industry. First, the government can restore confidence building by providing economic stimulus packages that can encourage the airline to return to travel and ensure safety. Furthermore, softening the passenger rules regarding the refund of the unflown tickets, reducing taxes and reducing overflight taxes, decreases the costs and can lift the industry. Second, to ease the repayment conditions of cancelled flights, regulatory relief is also crucial to both the airline industry and the passengers. It can help to restore customer confidence and the industry to return to the skies. Similarly, mutual recognition of global standards is important for effective application, and any temporary measures taken by the government should have a clear exit strategy. Last, air traffic experiences a huge impediment due to quarantine measures, and the majority cannot travel if it is in place. Thus, the governments of these countries need an alternative coordinated strategy consistent with health measures to manage air travel in COVID-19 and make the industry functional and safe for traveling. This study can be extended in future to evaluate the impact of lockdown and restrictions on the airlines passenger numbers and revenues. Moreover, the study can be expanded to analyze various airlines and their overall management during the pandemic.
Funding: This research is not supported by any funding.
Data Availability Statement: Not applicable.

Conflicts of Interest:
The authors declare no conflict of interest.

Appendix A. AR Model Forecasting
We have used the autoregressive model to examine the validity of the time series forecasting of our main results. The results validate the robustness of the results. Figures A1-A15 illustrates the graphical representations of the robustness result of the AR model. It implies that ALR declines until 2020-2021 and recovers subsequently, and the result supports the V-shaped and U-shaped recovery scenarios in these countries. Thus, the results support the main findings of our study. Funding: This research is not supported by any funding.
Data Availability Statement: Not applicable.

Conflicts of Interest:
The authors declare no conflict of interest.

Appendix A. AR Model Forecasting
We have used the autoregressive model to examine the validity of the time series forecasting of our main results. The results validate the robustness of the results. Figures  A1-A15 illustrates the graphical representations of the robustness result of the AR model. It implies that ALR declines until 2020-2021 and recovers subsequently, and the result supports the V-shaped and U-shaped recovery scenarios in these countries. Thus, the results support the main findings of our study.   Funding: This research is not supported by any funding.
Data Availability Statement: Not applicable.

Conflicts of Interest:
The authors declare no conflict of interest.

Appendix A. AR Model Forecasting
We have used the autoregressive model to examine the validity of the time series forecasting of our main results. The results validate the robustness of the results. Figures  A1-A15 illustrates the graphical representations of the robustness result of the AR model. It implies that ALR declines until 2020-2021 and recovers subsequently, and the result supports the V-shaped and U-shaped recovery scenarios in these countries. Thus, the results support the main findings of our study.