A fit to fly certificate is a doctor’s letter (or airline form) confirming you are medically safe to travel by air. Airlines may request it if a condition could worsen during flight or if special assistance is required.
It’s especially important to confirm you’re fit to fly if you are pregnant, recently unwell, recovering from injury, or have a chronic condition that may be affected by cabin pressure, reduced oxygen levels, limited mobility, or long travel time.
Many airlines use a standardized document called the Medical Information Form (MEDIF). It allows your treating clinician to describe your condition, confirm whether you are fit to fly, and specify any needs (oxygen, assistance, stretcher, escort, etc.).
When airlines may require a MEDIF
Passengers in the situations below often need a MEDIF or medical clearance. Exact rules vary by airline, so always check your carrier’s policy.
Common reasons include
- Using medical oxygen or needing oxygen arranged through the airline
- Using a portable oxygen concentrator (POC) or ventilator/respirator
- Needing a stretcher, incubator, or medical escort
- Having a condition that may suddenly deteriorate during travel
- Recent illness, injury, or surgery that could be affected by flying
- Late pregnancy (some airlines request documentation in the final weeks, often within 28 days of the due date)
What a fit to fly certificate usually includes
- Your diagnosis (in appropriate terms) and whether it is stable
- Date of onset / surgery date (if relevant) and current treatment
- Fitness to fly statement and any limitations
- Need for oxygen, wheelchair assistance, special seating, stretcher, escort, or medical devices
- Doctor’s name, contact details, signature, and date
For pregnancy, airlines commonly request gestational age, estimated due date, and confirmation of “no complications” (if true).
Download MEDIF forms
We’ve compiled MEDIF forms from top international airlines so you can download the right one quickly.
MEDIF Forms (Download List)
Check whether your airline needs the MEDIF sent before travel, and whether a separate “medical clearance” email confirmation is required.
