1. Air Force Security Office. Aircraft Operations Control System (Royal Thai Air Force, Bangkok, 2008)
2. COVID-19: Fly Safe with AirAsia - AirAsia's Safety Measures both the ground and in-flight services (AirAsia, 2019) https://newsroom.airasia.com/news/2020/4/28 covid-19-flying-safe-with-airasiasafety-measures-airasia-implements-on-ground-and-. in-flight-th
3. Emergency Decree on Public Administration in Emergency Situations to Control the Situation Deadly infectious disease outbreak of coronavirus disease 2019 (Bangkok Business, 2020) https://www.bangkokbiznews.com/news/872591
4. Report of the Center for Epidemic Management of Coronavirus Disease 2019 (COVID-19) on 29 April 2020 (Business people, 2020) https://www.prachachat.net/general/news-456931
5. Measures to prevent “Covid-19” Airports under the Department of Airports (Department of Airports, 2020) https://www.kaohoon.com/breakingnews/341847