COVID-19'UN ETKİSİ ALTINDA AVRUPA HAVACILIK SEKTÖRÜ

Yıl 2024, Cilt: 26 Sayı: 2, 365 - 388, 13.12.2024

Irmak Hatıpoğlu

https://doi.org/10.26468/trakyasobed.1390781

Öz

Covid-19 pandemisi, dünya genelinde birçok sektörü derinden etkilemiştir, ancak havacılık sektörü özellikle büyük bir krizle karşı karşıya kalmıştır. Pandemi döneminde seyahat yasakları, sağlık endişeleri gibi sebeplerle düşen talep, hava seyahatini hızla azaltmıştır. Havayolu şirketleri, uçuş iptalleri ve düşük doluluk oranları nedeniyle büyük gelir kayıpları yaşamıştır. Durum analizi yapmak için havacılık sektörünün performansını değerlendirmek ve iyileştirme fırsatlarını belirlemek önemlidir. Bu çalışma, veri zarflama analizi kullanarak Avrupa ülkelerinin havacılık sektöründeki etkinliklerini karşılaştırmak amacıyla yapılmıştır. Çalışmada pandeminin ülkeler genelindeki havacılık sektörüne olan etkilerini anlamaya yardımcı olmak amaçlanmış aynı zamanda Türkiye özelinde daha geniş bir incelemeye yer verilmiştir.

Anahtar Kelimeler

Avrupa, havacılık, etkinlik, pandemi müdahale stratejileri, karşılaştırmalı sektör analizi

European Aviation Sector Under the Impact of Covid-19

Öz

The Covid-19 pandemic has deeply affected many sectors around the world, but the aviation sector has faced a particularly major crisis. Falling demand during the pandemic period due to reasons such as travel bans and health concerns rapidly reduced air travel. Airline companies suffered huge revenue losses due to flight cancellations and low occupancy rates. To analyze the situation, it is important to assess the performance of the aviation sector and identify opportunities for improvement. This study was conducted to compare the efficiency of European countries in the aviation sector using data envelopment analysis. The study aims to help understand the effects of the pandemic on the aviation sector across countries and also includes a broader analysis of Turkey.

Anahtar Kelimeler

Europe, aviation, efficiency, pandemic response strategies, comparative sector analysis

Kaynakça

• Agarwal, S. (2014). “Efficiency Measure by Fuzzy Data Envelopment Analsis Model. Fuzzy Information and Engineering”, 6, 59–70. https://doi.org/https://doi.org/10.1016/j.fiae.2014.06.005
• Air Traffic Organization of the FAA, & EUROCONTROL. (2021). Special report on the impact of the COVID-19 pandemic on the U . S . and European ANS systems (Issue November).
• Airports Concil International. (2022). Positive and Immediate Impact on Global Air Travel Demand as Restrictions Relax. https://aci.aero/2022/06/28/positive-and-immediate-impact-on-global-air-travel-demand-as-restrictions-relax/#:~:text=For the full year 2021,world’s airports by 10.2 billion.
• Albers, S., Rundshagen, V. (2020). “European airlines strategic responses to the COVID-19 pandemic”, Journal of Air Transport Management, 87(July), 101863. https://doi.org/10.1016/j.jairtraman.2020.101863
• Andribet, P., Baumgartner, M., & Garot, J. M. (2022). “Reinventing European air traffic control based on the covid-19 pandemic experience”, Utilities Policy, 75(April 2021). https://doi.org/10.1016/j.jup.2022.101343
• Aviationweek. (2020). Slovenia Offers Airlines Financial Support To Revive Air Connectivity. https://aviationweek.com/air-transport/airports-networks/slovenia-offers-airlines-financial-support-revive-air-connectivity#:~:text=After the demise of flag,In late
• Bajić, J., Škurla Babić, R., & Tatalović, M. (2021). “Economic Impact of Covid-19 on Air Traffic Industry: Challenges in Croatia. EMC Review - Časopis Za Ekonomiju”, APEIRON, 21(1). https://doi.org/10.7251/emc2101254b Bally, G. (2022). “Switzerland made millions supporting Covid-hit aviation sector”, Swissinfo. https://www.swissinfo.ch/eng/business/switzerland-made-millions-supporting-covid-hit-aviation-sector/47844446
• Banker, R., Charnes, A., & Cooper, W. (1984). “Some Models for Estimating Technical and Scale Inefficiencies in Data Envelopment Analysis”, Management Science, 30, 1078–1092. https://doi.org/http://dx.doi.org/10.1287/mnsc.30.9.1078
• Barczak, A. (2021) “COVID-19 Pandemic — Financial Consequences for Polish Airports — Selected Aspects”, Aerospace, 8, 353.
• Bauranov, A., Parks, S., Jiang, X., Rakas, J., & González, M. C. (2021), “Quantifying the Resilience of the U.S. Domestic Aviation Network During the COVID-19 Pandemic. Frontiers in Built Environment”, 7(April), 1–9. https://doi.org/10.3389/fbuil.2021.642295
• BBC NEWS Türkçe. (2023). ABD, British Airways’e pandemideki uçuş iptalleriyle ilgili 1,1 milyon dolar para cezası kesti. https://www.bbc.com/turkce/articles/cw0pevl51wqo
• Bernathova, S., Cekan, P., Dzunda, M., Szabo, S., Mako, S., & Horvath, A. (2020), “Impact of global pandemic COVID-19 on Air Transport in Slovakia in the Period from March to June 2020”, NTinAD 2020 - New Trends in Aviation Development 2020 - 15th International Scientific Conference, Proceedings, June 2020, 24–27. https://doi.org/10.1109/NTAD51447.2020.9379096
• Bouwer, J., Krishnan, V., Saxon, S., & Tufft, C. (2022), “Taking stock of the pandemic’s impact on global aviation”, MCkinsey.
• Charnes, A., Cooper, W., & Rhodes, E. (1978), “Measuring the efficiency of decision making units”, European Journal of Operational Research, 2(6), 429–444. https://doi.org/https://doi.org/10.1016/0377-2217(78)90138-8 Cui, Q., Hu, Y., Yu, L. (2022), “Can the aviation industry achieve carbon emission reduction and revenue growth simultaneously under the CNG2020 strategy ? An empirical study with 25 benchmarking airlines”, Energy, 245. https://doi.org/10.1016/j.energy.2022.123272
• Department of Transport. (2020), “€80 million support package for Aviation Sector”, https://www.gov.ie/en/press-release/46b14-80-million-support-package-for-aviation-sector/, Erişim Tarihi: 03.07.2024
• DHA. (2023), “Türkiye dünyanın en çok turist ağırlayan 4. ülkesi oldu”, TRTHaber. https://www.trthaber.com/haber/turkiye/turkiye-dunyanin-en-cok-turist-agirlayan-4-ulkesi-oldu-767732.html#:~:text=2022’de 963 milyon kişi,verilerine ilişkin UNWTO raporu açıklandı.
• Díez-pisonero, R., Gago-garcía, C. (2022), “Air transportation and the COVID-19 pandemic : Towards a change of the path in the spanish airport network?”, Revista de Estudios Andaluces, 43, 159–187.
• Dube, K., Nhamo, G., & Chikodzi, D. (2021). “COVID-19 pandemic and prospects for recovery of the global aviation industry”, Journal of Air Transport Management, 92, 102022.
• Euromonitor. (2021), “No Top 10 Global Consumer Trends 2021”, https://www.euromonitor.com/top-10-global-consumer-trends-2021/report, Erişim Tarihi: 03.07.2024
• Euronews. (2021), “Araştırma: İlk Covid-19 vakası Vuhan pazarındaki bir kadın”, https://tr.euronews.com/2021/11/19/arast-rma-ilk-covid-19-vakas-vuhan-pazar-ndaki-bir-kad-n, Erişim Tarihi: 03.05.2024
• European Comission. (2021), “Details of Hungary’s support measures to help citizens and companies during the significant economic impact of the coronavirus pandemic”, https://commission.europa.eu/strategy-and-policy/coronavirus-response/supporting-jobs-and-economy-during-coronavirus-pandemic/state-aid-cases/hungary_en, Erişim Tarihi: 10.10.2024
• Exyuaviation. (2022), “New Slovenian government rules out new flag carrier”, https://www.exyuaviation.com/2022/05/new-slovenian-government-rules-out-new.html Erişim Tarihi: 10.10.2024
• Fathurahman, H., Berawi, M. A., Sulistyarini, I., Kusuma, A., Nasution, Y., & Komarudin. (2020), “Post COVID-19 Recovery Models and Strategies for Aviation in Indonesia”, International Journal of Technology, 11(6), 1265–1274. https://doi.org/10.14716/ijtech.v11i6.4455
• Fernandes, D. R. C., Falcão, V. A., Silva, C. F. A. da, da Silva, F. G. F., & Fernandes, L. H. C. (2023), “COVID-19: The Vaccination Program and Its Influence on Air Travel Demand in the U.S.A.”, Transportation Research Record. https://doi.org/10.1177/03611981231193609
• Florido-Benítez, L. (2021), “The effects of COVID-19 on Andalusian tourism and aviation sector”, Tourism Review, 76(4), 829–857. https://doi.org/10.1108/TR-12-2020-0574
• Gao, Y. (2022), “Benchmarking the recovery of air travel demands for US airports during the COVID-19 Pandemic”, Transportation Research Interdisciplinary Perspectives, 13, 100570. https://doi.org/10.1016/j.trip.2022.100570
• Georgiadis, P. (2022), Financial Times. https://www.ft.com/content/8bdb785a-4770-416c-b453-dbfcb1c21d68 , Erişim Tarihi: 5.10.2024
• Guo, J., Li, Y., Yang, Z., & Zhu, X. (2021), “Quantitative method for resilience assessment framework of airport network during COVID-19”, PLoS ONE, 16(12 December), 1–14. https://doi.org/10.1371/journal.pone.0260940
• Guo, J., Yang, Z., Zhong, Q., Sun, X., & Wang, Y. (2023), “A novel resilience analysis methodology for airport networks system from the perspective of different epidemic prevention and control policy responses”, PLoS ONE, 18(2 February), 1–14. https://doi.org/10.1371/journal.pone.0281950
• Guo, J., Zhu, X., Liu, C., & Ge, S. (2021), “Resilience Modeling Method of Airport Network Affected by Global Public Health Events”, Mathematical Problems in Engineering, 2021. https://doi.org/10.1155/2021/6622031
• Hava-İş Sendikası. (2022). Sünta Sivil Havacılık Sektöründe Yaşanan Kriz.
• Hanson, D., Toru Delibasi, T., Gatti, M., & Cohen, S. (2022), “How do changes in economic activity affect air passenger traffic? The use of state-dependent income elasticities to improve aviation forecasts.”, Journal of Air Transport Management, 98(January 2021), 102147. https://doi.org/10.1016/j.jairtraman.2021.102147
• Heiets, I., & Xie, Y. (2021), “The Impact of the COVID-19 Pandemic on the Aviation Industry”, Journal of Aviation, 5(2), 111–126. https://doi.org/10.30518/jav.933296
• Hiney, N., Efthymiou, M., & Morgenroth, E. (2023), “Impact of Covid-19 on Irish airport stakeholder relationships”, Annals of Tourism Research, 102, 103622. https://doi.org/10.1016/j.annals.2023.103622
• Hopancı, B., Akdeniz, H., & Şahin, Ö. (2021), “Covid19 Pandemi̇si̇ni̇n Havacilik Sektörü Üzeri̇n Etki̇leri̇. Mühendis ve Makine”, 62(704), 446–467. https://doi.org/10.46399/muhendismakina.874133
• IATA (2022a), “Air Passenger Numbers to Recover in 2024”. https://www.iata.org/en/pressroom/2022-releases/2022-03-01-01/ Erişim Tarihi: 5.09.2024
• IATA. (2022b), “Airlines Cut Losses in 2022; Return to Profit in 2023”. https://www.iata.org/en/pressroom/2022-releases/2022-12-06-01/ Erişim Tarihi: 5.09.2024
• IATA. (2022c), “Airlines reduce losses and expect profit in 2023”. https://airlines.iata.org/2022/12/07/airlines-reduce-losses-and-expect-profit-2023 Erişim Tarihi: 5.09.2024
• IATA. (2023), “Industry Insights & Market Data”, https://www.iata.org/en/services/statistics/industry-insights--market-data/?utm_source=google&utm_medium=cpc&utm_campaign=SMX004-Data-Awareness&gad_source=1&gclid=Cj0KCQiAr8eqBhD3ARIsAIe-buMd-_omcaMM4qfxYu8VKXEux7UsL5x4Ife9veIHeV2z88QL0-cGSxMaAvZsEALw_wcB
• Kaffash, S., & Khezrimotlagh, D. (2023), “U.S. network and low-cost carriers’ performance in response to COVID-19: Strictness of government policies and passengers’ panic”, Research in Transportation Business & Management, 46. https://doi.org/https://doi.org/10.1016/j.rtbm.2022.100835
• Kalkın, G. (2021), “COVID-19 ve Havacılık Sektörünün Geleceği: Havacılık Yönetimi Kapsamında Bir Değerlendirme”, Journal of Aviation, 5(1), 53–63.
• Kazda, A., Badanik, B., & Serrano, F. (2022), “Pandemic vs. Post-Pandemic Airport Operations: Hard Impact, Slow Recovery”, Aerospace, 9(12), 810. https://doi.org/https://doi.org/10.3390/aerospace9120810
• Keleş, M. K. (2023), “Geleneksel Havayolu Firmalarının Pandemi Öncesi ve Sonrası Etkinliğinin Veri Zarflama Analizi ile Ölçülmesi”, Mehmet Akif Ersoy Üniversitesi İktisadi İdari Bilimler Fakültesi Dergisi, 10(3), 1976–1987. https://doi.org/https://doi.org/10.30798/makuiibf.1220155
• Kelleher, S. R. (2022), “Zoom meetings have fundamentally altered how and why people hit the road for work. Now “bleisure” and “return to base” are corporate travel buzzwords in the new normal”, Forbes, https://www.forbes.com/sites/suzannerowankelleher/2022/03/12/covid-changed-business-travel/?sh=7ec271e553a0
• Khafidli, M. K., & Choiruddin, A. (2022), “Forecast of Aviation Traffic in Indonesia Based on Google Trend and Macroeconomic Data using Long Short-Term Memory”, 2022 International Conference on Data Science and Its Applications, ICoDSA 2022, 220–225. https://doi.org/10.1109/ICoDSA55874.2022.9862894
• Kim, M., & Sohn, J. (2022), “Passenger, airline, and policy responses to the COVID-19 crisis: The case of South Korea”, Journal of Air Transport Management, 98(December 2020), 102144. https://doi.org/10.1016/j.jairtraman.2021.102144
• Kitsou, S. P., Koutsoukis, N. S., Chountalas, P., & Rachaniotis, N. P. (2022), “International Passenger Traffic at the Hellenic Airports: Impact of the COVID-19 Pandemic and Mid-Term Forecasting”, Aerospace, 9(3). https://doi.org/10.3390/aerospace9030143
• Kuo, P. F., Brawiswa Putra, I. G., Setiawan, F. A., Wen, T. H., Chiu, C. S., & Sulistyah, U. D. (2022), “The impact of the COVID-19 pandemic on O-D flow and airport networks in the origin country and in Northeast Asia”, Journal of Air Transport Management, 100, 102192. https://doi.org/10.1016/j.jairtraman.2022.102192
• Kurnaz, S., Rodrigues, A., Kholiavko, N., Panchenko, O., & Tarasenko, A. (2022), “The Perspectives of the Air Transport Market in Turkey During Covid-19 Pandemic”, Management Theory and Studies for Rural Business and Infrastructure Development, 44(2), 235–243. https://doi.org/10.15544/mts.2022.24
• Kuznetsova, A. (2021), “Impact of COVID-19 on the Aviation Business in the Russian Federation”, Proceedings of the International Scientific Conference Hradec Economic Days 2021, 11, 495–506. https://doi.org/10.36689/uhk/hed/2021-01-049
• Kotoky, A., Modi, M., & Turner, M. (2020), “Covid 19 impact: Jobs are being wiped out at airlines worldwide, and there’s worse to come”, The Economic Times. https://economictimes.indiatimes.com/news/international/business/jobs-are-being-wiped-out-at-airlines-and-theres-worse-to-come/articleshow/77140124.cms?from=mdr
• Li, Y., Wang, J., Huang, J., & Chen, Z. (2022), “Impact of COVID-19 on domestic air transportation in China. Transport Policy”, 122, 95–103. https://doi.org/10.1016/j.tranpol.2022.04.016
• Liao, M., Wu, C., & Yan, H. (2022), “Recovery of Chinese low-cost carriers after the outbreak of COVID-19 pandemic”, Journal of Air Transport Management, 105, 102282. https://doi.org/10.1016/j.jairtraman.2022.102282
• Lee, Y. N. (2020), World Economy 5 charts show which travel sectors were worst hit by the coronavirus. CNBC. https://www.cnbc.com/2020/05/06/coronavirus-pandemics-impact-on-travel-tourism-in-5-charts.html
• Leppävuori, J., Liimatainen, H., & Baumeister, S. (2022), “Flying-Related Concerns among Airline Customers in Finland and Sweden during COVID-19”, Sustainability (Switzerland), 14(17), 1–18. https://doi.org/10.3390/su141710768
• Li, Y., Huang, Z., & Cui, Q. (2022), “Exploring the effect of COVID-19 on airline environmental efficiency through an interval epsilon-based measure model”, Environmental Science and Pollution Research, 29, 25623–25638. https://doi.org/10.1007/s11356-021-17610-3
• Macit, A., & Macit, D. (2020), “Türk Sivil Havacılık Sektöründe COVID-19 Pandemisinin Yönetimi”, Avrasya Sosyal ve Ekonomi Araştırmaları Dergisi, 4(7), 100–116.
• Manca, F., Sivakumar, A., Pawlak, J., & Brodzinski, N. J. (2023), “Will We Fly Again? Modeling Air Travel Demand in light of COVID-19 through a London Case Study”, Transportation Research Record, 2677(4), 105–117. https://doi.org/10.1177/03611981211025287
• Massy-Beresford, H. (2020), “Netherlands Pledges Up To $4.4B Aid For KLM Amid COVID-19 Crisis”, https://aviationweek.com/air-transport/airlines-lessors/netherlands-pledges-44b-aid-klm-amid-covid-19-crisis
• McMurtry, I. (2020), “Austrian Airlines Takes Financial Recovery Package”, https://airlinegeeks.com/2020/06/08/austrian-airlines-announces-financial-recovery-package/
• Mizutani, J., & Sakai, H. (2023), “The effects of frequent flyer programs in the competition with high speed rail: A case study of air passenger preference in Japan”, Journal of Air Transport Management, 106(November 2021), 102306. https://doi.org/10.1016/j.jairtraman.2022.102306
• Mumbower, S. (2022), “Airline market exit after a shock event: Insights from the COVID-19 pandemic”, Transportation Research Interdisciplinary Perspectives, 14, 100621. https://doi.org/10.1016/j.trip.2022.100621
• Özçelik, H., & Kandemir, B. (2017), “Veri Zarflama Analizi Ve İmalat Sektöründe Bir Uygulama”, Süleyman Demirel Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi, 22(1), 43–53.
• Park, J. H., & Kim, J. H. (2021), “The Impact of Airport Managerial Type and Airline Market Share on Airport Efficiency”, Sustainability, 13(2), 981. https://doi.org/https://doi.org/10.3390/su13020981
• Pegasus. (2020), Pegasus Yatırımcı İlişkileri, https://www.pegasusyatirimciiliskileri.com/medium/image/2020-3-ceyrek-yatirimci-sunumu_1011/view.aspx
• Pehlivanlı, E. A. (2020), “Covid-19’un Havalimanları Performansları Üzerine Etkisinin Değerlendirilmesi: Türkiye Havalimanları Örneği”, Journal of Turkish Studies, 15, 4, 905–922. https://doi.org/10.7827/turkishstudies.43897
• Pérez-Campuzano, D., Rubio Andrada, L., Morcillo Ortega, P., & López-Lázaro, A. (2022), “Visualizing the historical COVID-19 shock in the US airline industry: A Data Mining approach for dynamic market surveillance”, Journal of Air Transport Management, 101, https://doi.org/10.1016/j.jairtraman.2022.102194
• Rahman, M. K., Gazi, M. A. I., Bhuiyan, M. A., & Rahaman, M. A. (2021), “Effect of Covid-19 pandemic on tourist travel risk and management perceptions”, PLoS ONE, 16, 9, https://doi.org/https://doi.org/10.1371/journal.pone.0256486
• Rice, S., Ruskin, K. J., Winter, S. R., Crouse, S. R., Rice, C., & Richards, G. (2023), “An empirical analysis of American Passenger’s willingness to fly in commercial airplanes after vaccination against COVID-19”, Technology in Society, 73, 102241, https://doi.org/10.1016/j.techsoc.2023.102241
• Şahan, D. (2022), “Türkiye’nin Lojistik Kapasitesindeki Güncel Gelişmeler”, Uluslararası Ticaret ve Lojistikte Güncel Yaklaşımlar ve Değerlendirmeler, 57–82
• Seth, B., Saxena, P., & Arora, S. (2023), “Operational performance of Indian passenger airlines using hierarchical categorical DEA approach”, International Journal of System Assurance Engineering and Management. https://doi.org/10.1007/s13198-022-01852-6
• Şahin, Z., & Süzen, E. (2023), “Covid-19 Döneminde Havacılıkta Stratejik Yönetim ve Uçuş Verilerinin İncelenmesi”, Akademik Hassasiyetler, 10, 22, 260–282.
• Seth, B., Saxena, P., & Arora, S. (2023), “Operational performance of Indian passenger airlines using hierarchical categorical DEA approach”, International Journal of System Assurance Engineering and Management, https://doi.org/10.1007/s13198-022-01852-6
• Shi, Y., & Li, X. (2021), “Determinants of financial distress in the European air transport industry: The moderating effect of being a flag-carrier”, PLoS ONE, 16(11), 1–17. https://doi.org/10.1371/journal.pone.0259149
• Su, J., Wu, H., Tsui, K. W. H., Fu, X., & Lei, Z. (2023), “Aviation resilience during the COVID-19 pandemic: A case study of the European aviation market”, Transportation Research Part A, 177, 103835. https://doi.org/10.1016/j.tra.2023.103835
• Sugishita, K., Mizutani, H., & Hanaoka, S. (2024), “Disruption and recovery of the US domestic airline networks during the COVID-19 pandemic”, Journal of Air Transport Management, 114, 102504. https://doi.org/10.1016/j.jairtraman.2023.102504
• Sun, X., Wandelt, S., Fricke, H., & Rosenow, J. (2021), “The impact of covid-19 on air transportation network in the united states, europe, and China”, Sustainability, 13, 1–11. https://doi.org/10.3390/su13179656
• Song, K.-H., Choi, S., Elkosantini, S., & Suh, W. (2023), “Determining Factors Influencing Short-Term International Aviation Traffic Demand Using SHAP Analysis: Before COVID-19 and Now”, Sustainability, 15, 14924. https://doi.org/10.3390/su152014924
• Song, K. H., & Choi, S. (2021), “A study on the perception change of passengers on sustainable air transport following covid-19 progress”, Sustainability (Switzerland), 13(14). https://doi.org/10.3390/su13148056
• Statista. (2023), “Number of passengers uplifted by British Airways plc from 2008 to 2022”, https://www.statista.com/statistics/309349/british-airways-uk-passenger-numbers/#:~:text=Passengers uplifted by British Airways plc 2008-2022&text=2022 saw passenger numbers rise,million during the calendar year.
• Statista. (2023), “Number of scheduled passengers boarded by the global airline industry from 2004 to 2022”, https://www.statista.com/statistics/564717/airline-industry-passenger-traffic-globally/
• Sun, X., Wandelt, S., & Zhang, A. (2022), “COVID-19 pandemic and air transportation: Summary of Recent Research, Policy Consideration and Future Research Directions”, Transportation Research Interdisciplinary Perspectives, 16, 100718. https://doi.org/10.1016/j.trip.2022.100718
• T.C. Sağlık Bakanlığı. (2020), “Covid-19 (Sars-Cov-2 Enfeksiyonu) Genel Bilgiler, Epidemiyoloji ve Tanı, Bilimsel Danışma Kurulu Çalışması”.
• Tourist Maker. (2018). 10 Most Visited Countries 2018. https://www.touristmaker.com/blog/top-10-most-visited-countries/
• Tisdall, L., & Zhang, Y. (2020), “Preparing for ‘COVID-27’: Lessons in management focus – An Australian general aviation perspective”, Journal of Air Transport Management, 89, 101922. https://doi.org/10.1016/j.jairtraman.2020.101922
• Tisdall, L., Zhang, Y., & Zhang, A. (2021), “COVID-19 impacts on general aviation – Comparative experiences, governmental responses and policy imperatives”, Transport Policy, 110, 273–280. https://doi.org/10.1016/j.tranpol.2021.06.009
• TRTHABER. (2023). Türkiye’de ilk Covid-19 vakası üç yıl önce görüldü. TRT. https://www.trthaber.com/foto-galeri/turkiyede-ilk-covid-19-vakasi-uc-yil-once-goruldu/54687/sayfa-1.html Erişim Tarihi: 5.09.2024
• Tsui, K. W. H., Fu, X., Chen, T., Lei, Z., & Wu, H. (2021), “Analyzing Hong Kong’s inbound tourism: The impact of the COVID-19 pandemic”, IATSS Research, 45, 440–450. https://doi.org/10.1016/j.iatssr.2021.11.003
• Tuncal, A., Uslu, S., & Dursun, E. (2021), “Impact of Covid-19 on European and Turkey Air Traffic Networks”, Revista de Investigaciones Universidad Del Quindío, 33(2), 45–55. https://doi.org/10.33975/riuq.vol33n2.603
• Wandelt, S., Sun, X., & Zhang, A. (2023), “On the contagion leakage via incoming flights during China’s aviation policies in the fight against COVID-19”, Journal of Air Transport Management, 108, 102377. https://doi.org/10.1016/j.jairtraman.2023.102377
• World Health Organization (2020) “WHO Director-General’s Opening Remarks at the Media Briefing on COVID-19. 2020”, https://www.who.int/dg/speeches/detail/who-director-general-s-opening-remarks-at-the-mission-briefing-on-covid-19-13-march
• Wu, X., & Blake, A. (2023), “The Impact of the COVID-19 Crisis on Air Travel Demand: Some Evidence From China”, SAGE Open, 13, 1–14. https://doi.org/10.1177/21582440231152444
• Yücel, D., & Göncü, K. K. (2023), “Veri zarflama analizi ile Avrupa geçiş ekonomilerinin lojistik performans endeksi kullanılarak değerlendirilmesi”, Trakya Üniversitesi İktisadi ve İdari Bilimler Fakültesi, 1,12, 30–51. https://doi.org/10.47934/tife.12.01.02
• Zhang, L., Hou, M., Liu, Y., Wang, K., & Yang, H. (2022), “Measuring Beijing’s international air connectivity and suggestions for improvement post COVID-19”, Transport Policy, 116, 132–143. https://doi.org/10.1016/j.tranpol.2021.11.015
• Zhang, L., Yang, H., Wang, K., Bian, L., & Zhang, X. (2021), “The impact of COVID-19 on airline passenger travel behavior: An exploratory analysis on the Chinese aviation market”, Journal of Air Transport Management, 95, 102084