Good luck. Planes are pressurized, so just like breathing anywhere. If the plane depressurizes, everyone in the plane will be just like you.

Never had a problem flying

OOPS---pressurized plane does not work for COPD sufferers. I just learned that the air pressure on a airplane is set at the equivalent of 7000 ft.. elevation---basically same as the Vail Valley in Colorado. In Florida, I don't need oxygen during the day, but in the Vail Valley, Colorado, I was on oxygen 24/7.

Thank you Marilyn I was a bit concerned have a breath easy day

Information on FAA approved oxygen concentrators: They also list a couple of reconditioned ones for $700 or if your insurance carrier will pay 80%, you can get a new one for about the same cost.
https://www.google.com/search?q=faa+approved+po...