Tanggung jawab maskapai penerbangan terhadap pembatalan sepihak jadwal penerbangan di Indonesia (studi kasus: putusan Mahkamah Agung nomor 1391 K/PDT/2011) = Legal liability of airline company for unilateral cancellation airlines flight schedule in Indonesia (case study: Supreme Court decision no. 1391 K/PDT/2011) - Siagian, Fahri Gunawan, author (2014)