Traveling with oxygen
Airline Travel with portable oxygen Concentrators
The only oxygen equipment allowed on an airplane is the portable oxygen concentrator (POC). If you need oxygen in flight, you must take a portable oxygen concentrator with you, and , you must let your airline know ahead of time. They may require a doctor's letter to verify the need for the POC on the plane.
Each airline requires a different form from your doctor, these forms need to be renewed once per calendar year.