A Negative Synergy – A Review of Direct Subsidization Mechanisms for Scheduled Air Services Following the Covid-19 Pandemic in EU Law and Prospects for Improvement. Polish Yearbook of International Law, [S. l.], v. 40, p. 209–227, 2021. DOI: 10.24425/pyil.2021.138437. Disponível em: https://czasopisma.inp.pan.pl/index.php/pyil/article/view/2763. Acesso em: 3 oct. 2025.