ZULKARNAIN, Ahnis; PASARIBU, Hisar Monongam; SEMBIRING, Javensius. Estimating Air Travel Demand in North Sumatra Using Gravity Model Approach with Economic and Route Analysis. Langit Biru: Jurnal Ilmiah Aviasi, indonesia, v. 18, n. 1, p. 1–12, 2025. DOI: 10.54147/langitbiru.v18i1.1284. Disponível em: https://jurnal.overthinkingku.com/index.php/jurnal-ilmiah-aviasi/article/view/1284. Acesso em: 10 may. 2026.