It hasn’t always been easy for passengers on oxygen to attempt air travel. Now passengers are allowed to bring FAA-approved portable oxygen concentrators on board domestic flights or international flights starting or ending in the United States.

Passengers do still have to abide by a number of guidelines including advanced check-in, medical documentation, and batteries charged to 150 percent of the flight time.

To learn more about the procedures for flying with oxygen, please visit the FAA’s site and the Airline Oxygen Council.