Portable Oxygen Concentrator

Allowed with conditions. To use a portable oxygen concentrator (POC) on a U.S. flight, it must be a model that meets FAA acceptance criteria and carries the manufacturer's label certifying that (models such as the Inogen One, Respironics SimplyGo, Sequal Eclipse, and AirSep/CAIRE Focus and Freestyle lines commonly carry this label). It travels in the cabin, does not count against your carry-on limit, and must fit under the seat in front of you or be secured for takeoff and landing. Bring enough charged batteries in carry-on to cover at least 150% of your expected flight and ground-delay time — spare batteries are not allowed in checked bags. Tell the TSA officer before screening: if you can safely disconnect, the device goes through the X-ray; if you must stay connected, it's tested for explosive residue instead.

Check with your airline. Airlines generally want your POC in the cabin if you might need it in flight, and most require advance notice — often 48 hours — plus a doctor's letter or airline medical form before you travel. Policies on checking an unused POC vary by carrier, so confirm directly with your airline rather than assuming it can travel in checked baggage.