https://www.reuters.com/article/us-safety/going-into-hospital-far-riskier-than-flying-who-idUSTRE76K45R20110721

https://www.caa.co.uk/Consumers/Guide-to-aviation/Aviation-safety/

https://www.standard.co.uk/news/health/jeremy-hunt-helpline-may-need-more-medics-to-avoid-further-tragedy-after-babys-death-a3168056.html

https://www.gov.uk/government/organisations/air-accidents-investigation-branch/about

https://www.bmj.com/content/353/bmj.i2139

https://www.bmj.com/content/353/bmj.i2139/rr-54