Traveling with CPAP: security, airline rules, batteries and water, checked against the 2026 rules

What happens at TSA security with a CPAP?

TSA allows a CPAP in carry-on and checked bags. In a standard lane the machine, mask and tubing may stay in the carrying case for X-ray but may have to come out of your carry-on bag; in TSA PreCheck they may stay in the case and in the bag.

That is TSA's item page for CPAPs, last updated July 15, 2026, and its Disabilities and Medical Conditions page says the same. An older, undated TSA FAQ still says a CPAP "must be removed from its carrying case", so some officers may ask for that; TSA's own rule is that "the final decision rests with the TSA officer". The FAQ also lets you provide a clear plastic bag for the machine to go through the X-ray in. For help at the checkpoint, TSA Cares takes requests at least 72 hours before departure at (855) 787-2227. TSA says devices with lithium batteries should be in carry-on, and keeping the CPAP out of checked baggage also protects your treatment if a bag is lost.

Does a CPAP count as a carry-on, and what are your rights on board?

It does not count. Federal rules say airlines must let you bring assistive devices into the cabin and must not count them toward a carry-on limit, and U.S. airlines must let you use a labelled CPAP on aircraft designed for more than 19 passengers.

The rules are in the Department of Transportation's Air Carrier Access Act regulations, 14 CFR Part 382, current as of September 23, 2026. What they give you, and what they let the airline ask of you:

• Section 382.121: assistive devices go in the cabin if they fit in approved storage, and the airline "must not count assistive devices" toward a carry-on limit.
• Section 382.133: a U.S. airline must permit a CPAP that "displays a manufacturer's label that indicates the device meets FAA requirements" on aircraft originally designed for more than 19 passengers.
• The airline may require you to contact it 48 hours before departure, check in up to one hour before its general check-in deadline and bring fully charged batteries for at least 150 percent of the expected maximum flight duration.
• Section 382.27: connecting a CPAP to aircraft power is an optional service, and airlines are "not required to provide" it.
• If you do not meet the airline's conditions it may deny boarding, but it must give you a written explanation.

Can you use your CPAP on the plane?

Yes, if the machine carries the manufacturer's FAA-compliance marking and you have battery power the airline accepts. Put it in airplane mode and keep the humidifier tub empty.

ResMed's compliance letter dated March 17, 2026 lists the AirSense 11 AutoSet, AirSense 11 CPAP, AirSense 11 Elite and AirMini AutoSet as meeting RTCA/DO-160G Section 21, Category M, and says the marking may be engraved on the device or on a sticker; carry a copy of the letter. Delta's approved PAP list names AirSense 10 and AirMini models but not the AirSense 11, and Delta says a device that is not listed and lacks the "RTCA DO-160 Section 21 Cat H" label needs approval from its accessibility line, 404-209-3434, so call before the trip. The AirSense 11 guide says the machine will not run without the humidifier tub or side cover in place, so on a plane insert the empty tub, and switch to airplane mode when airline staff ask. The AirMini enters airplane mode when you hold its Bluetooth button for at least ten seconds. ResMed says its machines can run on the 110-volt, 400-hertz power used on aircraft.

How much battery do you need for a CPAP on a flight?

Enough for 150 percent of the flight time at Delta and JetBlue, and at United 150 percent of the flight time plus layovers and time at the airport. Watt-hours decide whether the battery can fly: up to 100 needs no approval, 101 to 160 needs the airline's approval, and over 160 is forbidden.

FAA PackSafe, updated August 11, 2026, says spare lithium-ion batteries and power banks travel in carry-on baggage only, with the terminals protected from short circuit, and allows at most two spares between 101 and 160 watt-hours per person, with the airline's approval. To find watt-hours, multiply volts by amp-hours; the FAA's example is a 12-volt, 8 amp-hour battery rated at 96 watt-hours. The battery maker's runtime estimate for your machine and settings is what turns required hours into a number of batteries. Worked examples from the airlines' own pages:

• Delta, 6-hour flight: 9 hours of battery. Delta does not require the 150 percent if you will not use the PAP on board.
• JetBlue, 6-hour flight: 9 hours, JetBlue's own example.
• United, 3-hour flight with a 2-hour layover: 6.5 hours, United's own example, plus the time you spend at the airport.
• Southwest has limited power banks to one per customer since April 20, 2026, each 100 watt-hours or less and not charged from in-seat power. It does not say whether a CPAP battery counts as a power bank, so ask before you fly.

What should you do with CPAP water when you travel?

Fly with the humidifier tub empty. At your destination, use the water your tub is made for: distilled water in the AirSense 11 standard tub, drinking-quality water in its cleanable tub, and room-temperature distilled water in the DreamStation 2.

ResMed's AirSense 11 guide warns: "Do not use the device with water in the humidifier tub while in transit (eg, on a plane or vehicle)", because water can spill into the device or be inhaled during turbulence. Philips' DreamStation 2 manual says: "Do not travel with water in the water tank." TSA does not name CPAP water on its pages. It allows larger amounts of medically necessary liquids if you declare them at the checkpoint, and says an item that alarms and cannot be cleared may not be allowed, so buying distilled water after security or at your destination is the simpler plan. ResMed's 2019 travel guide for the UK and Europe advises bottled water where the tap water is unsafe.

Do you need a converter to use a CPAP abroad?

Usually not. The AirSense 11, AirMini and DreamStation 2 power supplies accept 100 to 240 volts at 50 to 60 hertz, so what you need is a plug adapter or the right power cord.

The AirSense 11 power supply is rated "AC input range 100-240V, 50-60Hz", the AirMini 100 to 240 volts at 50 to 60 hertz, and the DreamStation 2 100 to 240 volts AC at 50 or 60 hertz. Philips says a traveler may need "a different power cord or an international plug adaptor", and the AirSense 11 guide tells you to bring the appropriate power cord for the region. Check the label on your own power supply before you leave, because an older or different model may be rated differently.

Does altitude change how a CPAP works?

The machines are rated for a range: the AirSense 11 from sea level to 9,870 feet and the AirMini to 8,500 feet. Do not change your pressure yourself for a trip; ask the care team.

ResMed says most of its devices compensate automatically for altitude but "some lightweight devices may require manual adjustment", and that without adjustment therapy may be less effective, so it suggests checking with your equipment provider before going to 8,500 feet or higher. Tell your sleep team before high-altitude travel, and also if you develop a respiratory illness or severe congestion on a trip.

Why does a trip in your first 90 days of CPAP matter for Medicare?

Medicare keeps paying for the machine only if you use it at least 4 hours a night on 70 percent of nights in a 30-day stretch during the first three months, and a clinician re-evaluates you between day 31 and day 91. Nights away without the machine count against you.

Those conditions come from LCD L33718, the Medicare policy for PAP devices. Seventy percent of 30 nights is 21 nights, so a stretch of 10 or more nights without the machine breaks any 30-day window that contains it. The window can be any 30 consecutive days in the first three months, so a trip is not automatically a problem, but the safest plan is to take the machine. If the criteria are not met, Medicare denies continued coverage of the machine and its accessories, and re-qualifying needs a repeat sleep test in a facility.