Are passengers allowed to use their own oxygen bottles on flights?

Passengers are not typically allowed to use their own oxygen bottles on flights because airlines have specific regulations regarding the use of medical oxygen. Airlines are required to ensure a standard of safety and compatibility on board, which includes adhering to strict guidelines about medical devices and oxygen supply. Personal oxygen bottles may not meet these safety standards, and their use could pose risks not only to the individual passenger but also to other passengers and crew members.

In contrast, airlines often provide supplemental oxygen in the form of portable oxygen concentrators that are specifically designed for air travel. These devices are usually subject to prior approval and must comply with the airline's policies and safety regulations. Thus, while there are exceptions where some devices might be allowed under specific circumstances or with proper documentation, the general rule is that personal oxygen tanks are not permitted on flights.