The Problems of Cancellation of Aircraft Tickets During the Covid-19 Pandemic from The Point of View of Consumer Protection in Indonesia and in the European Union. krtha bhayangkara [Internet]. 2024 Apr. 5 [cited 2024 Sep. 1];16(1). Available from: https://ejurnal.ubharajaya.ac.id/index.php/KRTHA/article/view/1191