In-Flight Medical Diversions
A small fraction of commercial flights divert each year because of an onboard medical emergency. The decision to divert is made by the captain with input from cabin crew, any medical professional among the passengers, and a contracted ground-based medical advisory service. This page explains what happens and why.
How the Decision Is Made
Cabin crew are trained first responders with access to an onboard medical kit, oxygen, and an AED on most widebody and many narrowbody aircraft. If the situation requires more support, the crew contacts a ground-based medical advisory service (MedLink, MedAire, etc.) via satcom or HF radio. A physician on the ground assesses the situation and recommends whether to continue to destination, divert, or hold for monitoring.
The captain retains final authority. Factors include: medical urgency, distance to nearest suitable airport, en-route airport capability, terrain, weather, and aircraft performance considerations.
Suitable Diversion Airports
"Suitable" means: acceptable runway length, ground handling capability, customs / immigration / health services at that hour, and proximity to a hospital with the right specialty. Not every airport on a map meets these. This is why polar and transoceanic routings pre-plan specific medical alternates.
Passenger-Facing Consequences
- ›Diversion to a non-destination airport; you continue when the aircraft is ready.
- ›Duty-of-care provisions under EU261 and similar frameworks apply when the total delay exceeds thresholds.
- ›Cash compensation usually not payable: medical diversion is typically an extraordinary circumstance outside the airline's control.
- ›Connections may be missed; standard re-protection procedures apply.
Informational. Not medical or operational guidance. See Terms of Service.