Analisa Pemahaman, Persepsi Kerentanan, Persepsi Tingkat Keparahan, Sikap, Norma Subjektif, dan Persepsi Kendali Perilaku terhadap Kesediaan untuk Bepergian dengan Pesawat Terbang dalam Situasi Pandemi COVID-19 di Indonesia = Analysis of Understanding, Perceived Vulnerability, Perceived Severity, Attitude, Subjective Norm, and Perceived Behavioral Control Towards Willingness to Fly During COVID-19 Pandemic in Indonesia