PackSafe - Portable Oxygen Concentrators (POCs)
Inogen One, Sequal Eclipse, Airsep Lifestyle and others approved by FAA
List of POCs that meet FAA specifications for inflight use
Portable oxygen concentrators (POCs) do not actually contain or generate oxygen, they concentrate it from the ambient air.
Those depending on a POC while traveling must bring sufficient spare batteries in carry-on baggage for the duration of the flight. Spare batteries must be protected from damage and short circuit.