Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Drones was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 16 days and the median time to publication was 40 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Abdelrahman Elsaid | Konstantinos Topouzelis |
| Abderrahmane Lakas | Kotaro Hoshiba |
| Abhijeet Ravankar | Kristoffer Gryte |
| Achilleas Tripolitsiotis | Krzysztof Sibilski |
| Adam Kiczko | Krzysztof Skabek |
| Adão Silva | Kursat Kara |
| Adi Azriff Basri | Kye Adams |
| Adiel Ismail | Kyle Dunno |
| Agoston Resta | László Bertalan |
| Ahmad Khan | Laura Inzerillo |
| Ahmad Taher Azar | Laura Prosdocimi |
| Ahmed Alamouri | Le The Dung |
| Ahmed El Oualkadi | Leonardo De Mello Honório |
| Aiguo Patrick Hu | Leonardo Lecce |
| Akos Kereszturi | Leslie Wong |
| Alaa A. R. Alsaeedy | Linas Balčiauskas |
| Alberto Martini | Loïca Avanthey |
| Alejandro Sanchez-Carmona | Lorenzo Brezzi |
| Alessandro Conti | Lubos Rejfek |
| Alessandro Fedele | Luca Fallati |
| Alessandro Giuseppi | Ludovit Kovanic |
| Alessandro Vizzarri | Luis F. Gonzalez |
| Alessio Cardaci | Luis Miguel González De Santos |
| Alessio Fascista | Luiz Carlos Sandoval Goes |
| Alexey V. Shvetsov | Lukasz Orman |
| Alfred Mayalu | Maciej Dobrzański |
| Ali Nadir Arslan | Magdalena Smigaj |
| Alisson Brito | Maggi Kelly |
| Alon Davidy | Mahendra Bhandari |
| Ana Cláudia Teodoro | Mahshid Javidsharifi |
| Ana Navarro Ferreira | Majed Alwateer |
| Anandarup Mukherjee | Manlio Bacco |
| Anastasios Dimou | Manuel Pulido Fernández |
| André Duarte | Marcelo Guzman |
| André Luís Marques Macato | Marco Baldo |
| Andrea Motorni | Marco Balsi |
| Andrea Piemonte | Marco Paterni |
| Andreas Birk | Marcos Arza |
| Andrej Novák | Margaret Kalacska |
| Andrew H. Lassiter | Margarita Mulero-Pázmány |
| Andrew Weinert | Maria Nadia Postorino |
| Andrey Sirin | Marina Michelena |
| Andrey V. Savkin | Marius Minea |
| Andrija Krtalić | Marius Petrila |
| Andrzej Stateczny | Martin Mokroš |
| Anestis Koutsoudis | Martin Štroner |
| Ángel A. Rodríguez-Sevillano | Marx Leandro Naves Silva |
| Angelo Trotta | Masood Varshosaz |
| Anita Prapotnik Brdnik | Massimiliano Pepe |
| Anna Banaszek | Mathew Legg |
| Anselme Muzirafuti | Matija Krznar |
| Anton Koval | Mauro Innocente |
| Antoni Grau | Mauro Sebastián Innocente |
| Antonia Spano | Mbulisi Sibanda |
| Antonio Santo | Mehdi Hosseinzadeh |
| Apostolos Papakonstantinou | Mehran Mehrandezh |
| Arjasakusuma Sanjiwana | Meiwei Kong |
| Arnadi Murtiyoso | Michael D. Collins |
| Artan Hysa | Michael Hodgson |
| Artur M. Gafurov | Michail-Alexandros Kourtis |
| Artūras Kilikevičius | Michal Weiszer |
| Arturo Reyes-González | Michel Kasser |
| Asiya Khan | Micky B Frisch |
| Atsuhiro Iio | Miguel Ángel Moreno |
| Aurelio Bermúdez | Min Xia |
| B. N. Pavan Kumar | Mingguo Ma |
| Baoqi Huang | Mingliang Bai |
| Basaran Bahadir Kocer | Mircea-Bogdan Radac |
| Basman Elhadidi | Mladen Jurišić |
| Béla Takarics | Mladen Zrinjski |
| Bikash Rajan Parida | Mohamad Awad |
| Bilal H. Alsalam | Mohamed Moussa |
| Blake M. Allan | Mohammad Meraj Mirza |
| Bo Yang | Mohammed H. Alsharif |
| Bogdan Walek | Mohd Anuaruddin Bin Ahmadon |
| Boris Galkin | Mostafa Hassanalian |
| Boris Miller | Mostafa Mjahed |
| Boyang Li | Moustafa Nasralla |
| Brandon Chasco | Muhammad Asghar Khan |
| Bruno Gonçalves | Mukhtar Ahmed |
| Buddhika Madurapperuma | Nansong Wu |
| Cai Luo | Nasim Chitsaz |
| Carlos Enríquez | Nguyen Dinh Dung |
| Carlos Soria | Nguyen Ngoc-Phi |
| Catherine Torcivia | Nicolo Camarretta |
| Chandra Pappu | Nikolay Todorov Atanasov |
| Chang Cao | Nusret Demir |
| Chang Liu | Omar Sami Oubbati |
| Chao Huang | Oscar Montoya |
| Chaofan Wu | Osip Kokin |
| Chenyu Huang | Ou Ma |
| Chiara Casarotti | Pablo Rangel |
| Chiman Kwan | Panagiotis Partsinevelos |
| Chinthaka Premachandra | Panagiotis Sarigiannidis |
| Chris Lowe | Paolo Fallavollita |
| Christoph Steup | Parham Nooralishahi |
| Christopher Ramezan | Parth S. Thakar |
| Christyan Cruz Ulloa | Parvathy Rajendran |
| Clemente Ibarra-Castanedo | Paul Sestras |
| Costas Armenakis | Paula Redweik |
| Cristian Pérez-Granados | Paulo E. Cruvinel |
| Cristina Catita | Paulo Eduardo Teodoro |
| Cully Hession | Pavel Fiala |
| Dainius Udris | Pavol Kurdel |
| Daisuke Watanabe | Paweł Burdziakowski |
| Daniel H. Stolfi | Pawel Tysiac |
| Daniele Ventura | Paweł Ziolkowski |
| Danish Khan | Pay Liam Lin |
| Daosen Zhai | Pedro Orgeira-Crespo |
| Dariusz Popielarczyk | Pei Wang |
| Darrell W. Pepper | Pei-Chi Shao |
| David L. Kulhavy | Pei-Wei Tsai |
| David Valiente | Pericles Panagiotou |
| Davide Antonio Cucci | Peter John Burke |
| Da-Yu Kao | Peter Stütz |
| Dehua Mao | Phillip Walker |
| Denis Butusov | Pier Matteo Barone |
| Denis Horvath | Pietro Manzoni |
| Denis V. Makarov | Piotr Cofta |
| Deshi Li | Pradeep V Malaji |
| Devrim Akca | Przemysław Mazurek |
| Di Hu | Radoslava Bekova |
| Diogo Duarte | Rafael Bailón-Ruiz |
| Dmitriy Kritskiy | Rafał Kowalik |
| Donghoon Kim | Raman Singh |
| Dongwon Jung | Raymond M. Danner |
| Dorota Zawieska | Renato Filipe Henriques |
| Duc-Tien Nguyen | Reza Alizadeh Kordabad |
| Dumitrescu Catalin | Ria Sinha |
| Ebadat Ghanbari Parmehr | Riaan Stopforth |
| Edison Pignaton De Freitas | Richard Hann |
| Edson Takashi Matsubara | Richard Overill |
| Egidio D'Amato | Richard Souza |
| Ehsan Khoramshahi | Robert Bialik |
| Elena Basan | Robert Hewson |
| Elena V. Efremova | Robert Jackisch |
| Emanuele Barca | Róbert Szabolcsi |
| Emmanouel T. Michailidis | Roberto Opromolla |
| Enie Hensel | Rogério Campos-Rebelo |
| Enrique Guerrero | Rolf Mueller |
| Eric A. Ramos | Roman Shults |
| Erica Isabella Parisi | Roman Skidanov |
| Esteban Valencia | Roman Yavich |
| Esther Salamí | Rone Ilídio Da Silva |
| Eunice Nduati | Rudolf Urban |
| Evangelos Yfantis | Rui Taborda |
| Fabrice Saffre | Ryan Wallace |
| Fei Liu | Sachin Sharma |
| Feja Lesniewska | Saeed Alsamhi |
| Felix Orjales | Saeed Hamood Alsamhi |
| Filip Škultéty | Saeid Pourroostaei Ardakani |
| Flavia Causa | Sagar Chowdhury |
| Fran Domazetović | Saifur Rahman Sabuj |
| Francesco Marinello | Saleh Mobayen |
| Francisco Javier Mesas Carrascosa | Salvatore Corcione |
| Francisco Valera | Salvatore Ponte |
| Fulin Luo | Samah Ben Ayed |
| Gabriel Marangon | Sangman Moh |
| Gail Schofield | Sante Francesco Rende |
| Gang Wang | Santiago Zazo |
| Gaurav Choudhary | Sara Roos-Hoefgeest Toribio |
| Gernot Paulus | Satoshi Yamamoto |
| Gil Gonçalves | Scott Xiang Fang |
| Giordano Teza | Sebastien Duplaa |
| Giorgio Anfuso | Sebastien Hengy |
| Giulia Sammartano | Seon Jin Kim |
| Giulio Casini | Serafin Lopez-Cuervo Medina |
| Giuseppe Ciaburro | Sergio Fernandez |
| Giuseppe Del Core | Seyyed Meghdad Hasheminasab |
| Giuseppe Di Stefano | Shane Siebenaler |
| Glen Throneberry | Shanshan Wei |
| Gordana Kaplan | Sheela Ramanna |
| Görres Grenzdörffer | Sheng Nie |
| Greg Gogolin | Sheng Wang |
| Grzegorz Kopecki | Shikun Zhou |
| Guillermo Valencia-Palomo | Shirin Malihi |
| Guoqiang Zheng | Shivakumara Palaiahnakote |
| Hailong Huang | Shi-Wei Lo |
| Haim Abramovich | Shlomi Hacohen |
| Hamish Campbell | Shrit Omar |
| Hann Woei Ho | Shuting Yang |
| Hanno Hildmann | Sidney C. De Lucena |
| Haocai Huang | Sophie F. Armanini |
| Heikki Hyyti | Stephan Helma |
| Hezhen Lou | Su Zhang |
| Higinio Jorge | Subramanian Ramasamy |
| Hirokazu Madokoro | Sultan Shoaib |
| Honglei Ji | Sunan Huang |
| Hongtian Chen | Suraj Pawar |
| Hriday Bavle | Susan E. Meyer |
| Huapeng Yu | Sutthiphong Srigrarom |
| Hugo Costelha | Tadeo Espinoza-Fraire |
| Hwang-Cheng Wang | Tae-Won Ban |
| Ievgeniia Kuzminykh | Tagir Z. Muslimov |
| Ihn-han Bae | Taha Elmokadem |
| Ikjune Yoon | Tairan Liu |
| Ilyas Nurmemet | Taner Cokyasar |
| Ing-Chau Chang | Tarek Elderini |
| Ionica Oncioiu | Teodor Rusu |
| Ismael Colomina | Thomas Lagkas |
| Israel Quintanilla García | Tiago Dias |
| Ivan Forenbacher | Tien-Yin Chou |
| Ivan Petrunin | Timothy Amukele |
| Iván Puente Luna | Timothy Sands |
| Jacek Smereka | Titilayo Ogunwa |
| Jack Wang | Todd Buters |
| James Magidi | Tor Erik Evjemo |
| Jamie Dyer | Tri Dev Acharya |
| Ján Bačík | Tuan Anh Nguyen |
| Jan Klesa | Tzu-Hsien Sang |
| Jan Komarek | Ulf Mallast |
| Jan Leuchter | Umberto Andriolo |
| Jane Jean Kiam | Urszula Marmol |
| Jarosław Pytka | Valeria-Ersilia Oniga |
| Javaan Chahl | Van Parunak |
| Javier Leon | Vasil Yordanov |
| Jawad Yasin | Vasily Desnitsky |
| Jeff Delaune | Viacheslav Moskalenko |
| Jesús Fernández-Hernández | Victor Ramos |
| Jesús Jiménez López | Victor Sanchez-Aguero |
| Jiaming Na | Vinko Škrlec |
| Jianfeng Ren | Vipin Kumar |
| Jinchao Chen | Vishal Sharma |
| Jing-Sin Liu | Vladan Papic |
| Jingzhe Wang | Vladan Papić |
| Jiri Cecrdle | Vladimir E. Ostashev |
| Jiyu Li | Volodymyr Polishchuk |
| Joanna Zietkiewicz | Wai-keung Fung |
| Joanne Halls | Wang Jia |
| Joaquín Torres-Sospedra | Wei-Cheng Liu |
| John Murray | Wei-Chuan Chiang |
| Jorge Delgado | Wenchao Li |
| Jorge Martínez Guanter | Wen-Cheng Liu |
| Jose Ernesto Gomez Balderas | Wenze Yang |
| José Manoel Balthazar | Wojciech Stecz |
| José Martinez-Carranza | Woonghee Lee |
| José Simão Antunes Do Carmo | Xiangxiong Kong |
| Jose-Luis Sanchez-Lopez | Ximan Wang |
| Joseph Hupy | Ximeng Xu |
| Joseph Kreimer | Xinghua Li |
| Joshua T. Kelly | XinMing Zhang |
| Joydev Ghosh | Xu-Dong Zhu |
| Juan A. Besada | Xuejian Wu |
| Juan José Fuldain González | Yali Zhang |
| Juan M. Santos | Yeison Alberto Garcés - Gómez |
| Juan Sandino | Yeongmin Jo |
| Jung-Min Park | Yi Sun |
| Jūratė Sužiedelytė-Visockienė | Ying-Yen Chen |
| Kai Zhou | Yixin He |
| Kamil Krasuski | Yongkuk Lee |
| Kanji Watanabe | Yu Wu |
| Karl-Arne Johannessen | Yuanxun Shao |
| Katarína Pukanská | Yun-Ping Sun |
| Kaveh Samimi-Namin | Zdeněk Dvořák |
| Kefu Yu | Zhenhua Zou |
| Keiko Ioki | Zhenming Peng |
| Keisuke Otsuka | Zhenxing Gao |
| Kenji Uchiyama | Zhexiong Shang |
| Kenneth Whitehead | Zhiqun Hu |
| Ki-Baek Lee | Zhonghua Hong |
| Kirill Krinkin | Zinon Vlahostergios |
| Klaus Thoeni | Zoltan Koppanyi |
| Konert Anna | Zoltan Torok |
| Konstantinos Skiadopoulos |
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