1. 1. Chappelle W, Goodman T, Reardon L, Thompson W. An analysis of post-traumatic stress symptoms in United States Air Force drone operators. Journal of Anxiety Disorders. 2014;28(5):480-487. doi:10.1016/j.janxdis.2014.05.003

2. 2. Bor R, Field G, Scragg P. The mental health of pilots: An overview. Counselling Psychology Quarterly. 2002;15(3):239-256. doi:10.1080/09515070210143471

3. 3. Britt TW, McGhee JS, Quattlebaum MD. Common mental disorders among US army aviation personnel: Prevalence and return to duty. Journal of Clinical Psychology. 2018;74(12):2173-2186. doi:10.1002/jclp.22688

4. 4. Jones DR, Ireland RR. Aeromedical regulation of aviators using selective serotonin reuptake inhibitors for depressive disorders. Aviation, Space, and Environmental Medicine. 2004;75 5:461-470.

5. 5. Kenedi C, Friedman SH, Watson D, Preitner C. Suicide and Murder-Suicide Involving Aircraft. Aerospace Medicine and Human Performance. 2016;87(4):388-396. doi:10.3357/amhp.4474.2016

6. 6. Pasha T, Stokes PRA. Reflecting on the Germanwings disaster: A systematic review of depression and suicide in commercial airline pilots. Frontiers in Psychiatry. 2018;9:86. doi:10.3389/fpsyt.2018.00086

7. 7. Wu AC, Donnelly-McLay D, Weisskopf MG, McNeely E, Betancourt TS, Allen JG. Airplane pilot mental health and suicidal thoughts: a cross-sectional descriptive study via anonymous web-based survey. Environmental Health. 2016;15(1):121. doi:10.1186/s12940-016-0200-6