GPs are not trained or indemnified to ascertain a patient’s fitness to fly and this does not come under the remit of our General Medical Services contract held by the NHS.  The final decision on whether or not to carry a passenger is that of the airline and sometimes the airline’s medical team can help.  If you have a medical condition which may bring into question your fitness to fly, the Civil Aviation Authority advises:

The majority of in-flight emergencies occur in situations when an individual’s medical condition is unknown to the airline and it is therefore essential that the passenger’s physician sends adequate details well in advance of the flight to the carrier. Most airlines have medical advisors who provide advice and “clear” passengers as fit to fly.

The key information that they require is:

• the nature of the individual’s condition and its severity/stability,
• medication being taken, and
• any pertinent information about mobility.

The clearance can be done by telephone or by formal communication using the MEDIF form, available through travel agents or from the internet, which allows the medical information to be structured in a manner that can be processed by the majority of airlines.

The final decision whether or not to carry a passenger is that of the airline, but the more information that is provided in advance, the more likely it is that a reasonable, evidence based decision can be made.

(https://www.caa.co.uk/passengers-and-public/before-you-fly/am-i-fit-to-fly/guidance-for-health-professionals/assessing-fitness-to-fly/ )

A medical summary can be requested from your GP Practice for you to share with the airline in these circumstances.  Your GP cannot give an opinion on your fitness to fly – this decision lies with the airline, or alternatively you can seek further advice from a private travel clinic.