What documents are requred for the use of an auxiliary breathing apparatus? February 09, 2022 08:02 Updated assengers using a portable oxygen concentrator(POC) must submit a doctor's note upon making a reservation. Related articles Can I carry an auxiliary breathing apparatus on the plane? I'd like to reserve an emergency exit seat. Do you have any conditions? Can I take medical items(a syringe) on board? What are the regulations for a carry-on baggage? Can I check in a wheelchair?