Perbandingan Kasus Tiket Pesawat di Indonesia Berdasarkan Putusan KPPU No. 15/KPPU-I/2019 dengan Kasus Kartel Kargo Pesawat di Uni Eropa Berdasarkan Putusan Komisi Eropa Case At.39258 = Comparison of Airplane Ticket Case in Indonesia Based on KPPU Decision No. 15/KPPU-I/2019 with the Aircraft Cargo Cartel Case in the European Union Based on the European Commission Decision Case At.39258