Do airlines count a CPAP machine as a carry-on bag?

No. In the United States, the Air Carrier Access Act (ACAA) requires airlines to allow passengers with disabilities to bring assistive devices, including CPAP machines, in the cabin without counting them against carry-on bag allowances. This applies to all US carriers and foreign carriers operating in the US. EU regulations provide similar protections under EC 1107/2006.

Does a CPAP machine need to be removed at airport security?

Yes. TSA requires CPAP machines to be removed from the carrying case and placed in a separate bin for X-ray screening, similar to laptops. Inform the security officer that you have a CPAP. The machine will not be swabbed or tested unless requested for additional screening.

Can I bring distilled water for my CPAP on a plane?

Distilled water for CPAP humidifiers is subject to the standard 100ml liquid rule in carry-on. You can bring a container of 100ml or less. For longer trips, most hotels stock distilled water, or you can buy it at the destination. Alternatively, travel without the humidifier on the flight itself.

Do I need a doctor's note to bring a CPAP on a plane?

No documentation is legally required in the US or EU to bring a CPAP on board. However, carrying a letter from your doctor or a copy of your prescription can be helpful when dealing with airline staff unfamiliar with the rules, especially on international routes.

Can I use my CPAP on the plane?

Many airlines permit CPAP use during flight, particularly on long-haul routes. Some aircraft seats have power outlets that can power a CPAP. Contact your airline before travel to confirm power availability on your specific route and aircraft type. Battery-powered CPAP travel units are an alternative for flights without power.

CPAP Machine on a Plane: Rules, Tips and Airline Policies

Continuous Positive Airway Pressure (CPAP) machines are medically necessary devices for millions of people with sleep apnea. Traveling with a CPAP raises specific questions about carry-on allowances, security screening, power availability, and distilled water — all of which have clear answers that most airline staff may not immediately know.

CPAP as a Medical Device: Your Legal Rights

US Rights Under the ACAA

The Air Carrier Access Act (ACAA) prohibits US airlines from discriminating against passengers with disabilities. CPAP and BiPAP machines are classified as assistive/medical devices under ACAA protections, which means:

Airlines cannot count a CPAP machine as your carry-on bag
Airlines cannot charge fees for bringing a CPAP in the cabin
Airlines must allow the CPAP in the cabin even if you have already used your carry-on and personal item allowances

This applies to all US airlines (American, Delta, United, Southwest, etc.) and to foreign airlines operating flights to or from the United States.

If an airline employee tells you the CPAP counts as your carry-on, you are entitled to politely but firmly inform them that this is incorrect under the ACAA.

EU Rights Under EC 1107/2006

EU Regulation 1107/2006 requires airlines to provide assistance to passengers with disabilities and reduced mobility. Under this framework, medical devices necessary for a passenger's health are treated separately from standard baggage allowances on EU-regulated flights.

The protections in the EU are broadly similar to the ACAA: airlines operating within the EU cannot refuse to accommodate medically necessary devices or charge for their transport.

Other Regions

Outside the US and EU, protections vary. Most major airlines worldwide have policies permitting CPAP devices in the cabin, but the legal backing differs:

Australia: The Disability Discrimination Act and CASA regulations provide similar protections
Canada: Canadian Transportation Agency rules protect passengers with disabilities
Other countries: Check with the specific airline and national aviation authority

Security Screening With a CPAP

What Happens at TSA

TSA requires CPAP machines to be:

Removed from the carrying case and placed in a separate bin for X-ray
Screened with the X-ray machine like a laptop

The CPAP should be placed in the bin alone if possible — screening with other items can make the image harder for the officer to read and may prompt a secondary inspection.

CPAP accessories that go through normally:

Masks and hoses (stay in the bag)
Power adapters (can stay in the bag)
Humidifier chambers (can stay in the bag, but remove water first)

Handling CPAP Equipment at Security

Keep your CPAP in a clear plastic bag or dedicated travel case that opens completely flat. This makes it easiest to remove and place in the bin. If you are traveling with distilled water in the humidifier chamber, empty it before security — liquids in CPAP equipment will trigger additional screening.

TSA PreCheck does not exempt you from removing a CPAP — the machine must still be screened separately. However, PreCheck lanes tend to move faster and officers are generally more familiar with medical equipment.

Distilled Water for CPAP Humidifiers

Most CPAP machines with humidifiers require distilled (not tap) water to prevent mineral buildup and bacterial growth.

Liquid Rules in Carry-On

Distilled water, like all liquids, is subject to the 100ml rule in carry-on baggage. You can bring:

One 100ml container of distilled water through security
Larger amounts in checked baggage

For longer trips, this is often not practical. Common solutions:

Buy distilled water at the destination: Most supermarkets in Europe, North America, and Australia stock distilled water. Request it specifically — "distilled water for a CPAP machine" is understood in most pharmacies and supermarkets.

Ask the hotel: Many hotels, particularly business hotels, will supply distilled water for CPAP users on request. Call ahead to confirm availability.

Fly without the humidifier: Many CPAP users simply do not use the humidifier during flights, as the flight itself is relatively short-duration. You can also disable the humidifier in CPAP settings and reconnect it at the destination.

Use a CPAP travel bottle: Some CPAP manufacturers sell small distilled water bottles (in 100ml sizes) specifically for travel and TSA compliance.

Power Adapters and Voltage

CPAP machines are available in two power categories: standard home units and travel-specific models.

Standard CPAP Units

Most modern CPAP machines (ResMed AirSense series, Philips DreamStation, etc.) are dual-voltage — they operate on 100–240V, 50–60Hz. This means the machine itself works globally without a voltage converter. You only need:

A plug adapter for the destination country's socket type
The power cord that came with your machine

Check the label on your CPAP power supply — it should state the voltage range. If it says "100-240V" you are covered globally.

Travel CPAP Models

Dedicated travel CPAPs (ResMed AirMini, Transcend Mini, etc.) are smaller, lighter, and specifically designed for cabin travel. They often include:

DC power input for car adapters or aircraft power
Integrated battery options
Bluetooth app control
Reduced size that fits more easily under seats

Using a CPAP on the Plane

Many long-haul aircraft seats have power outlets (AC or USB-C) that can power a CPAP. Whether a specific aircraft and seat has power depends on:

Airline
Aircraft type
Specific seat (business class seats usually have power; economy varies)

Contact your airline's accessibility or special assistance team before booking to confirm power availability. Seat-map tools on sites like SeatGuru show power outlet availability by seat.

Some airlines (Emirates, Singapore Airlines, most transatlantic carriers) have power in economy on long-haul routes. Short-haul carriers typically do not.

Battery-Powered CPAP Options

For flights without power, or as a backup, battery-powered CPAPs offer an alternative:

Integrated battery packs: Some travel CPAP models have optional battery modules. The ResMed AirMini Battery Pack, for example, provides 1–2 nights of use and travels as carry-on.

External battery banks: Large-capacity battery banks (often marketed as CPAP batteries or solar generator units) can power standard CPAPs. These larger batteries (often 150–250Wh) are subject to airline battery rules — units over 160Wh may be prohibited.

Lithium CPAP batteries in carry-on: Lithium batteries for CPAPs follow the same rules as all lithium batteries — carry-on only, never in checked baggage. Units between 100–160Wh require airline approval. Contact the airline before travel with the watt-hour rating.

What Documentation to Carry

While no documentation is legally required in the US, carrying the following makes travel smoother:

Doctor's letter or prescription: A brief letter on medical letterhead confirming you require a CPAP machine. Particularly useful on international flights with carriers unfamiliar with ACAA protections.
Printout of ACAA provisions: Available from the US Department of Transportation website. A useful backup if staff insist on counting the CPAP as carry-on.
Power supply specifications: In case of customs questions, having the voltage specs on the device label visible saves time.

Major Airline Policies for CPAP

American Airlines

Allows CPAP machines in the cabin as medical devices, not counted against carry-on limits. Power outlets available in many seats on long-haul routes. Contact Accessibility Services to note the CPAP requirement on your booking.

Delta Air Lines

Permits CPAPs in the cabin under ACAA provisions. Delta's website explicitly lists CPAP devices as medical equipment that does not count as a carry-on bag. Recommends contacting Accessibility Desk at least 48 hours before travel.

United Airlines

Allows CPAPs in the cabin as assistive devices. United recommends notifying the airline during booking using the "special assistance" section. Power at seats varies by aircraft.

Southwest Airlines

Permits CPAPs as medical devices without counting them as carry-on. Southwest does not have assigned seating, so board in your boarding group and ask for a seat with power if you plan to use the machine during flight.

British Airways

Permits CPAPs under EU/UK accessibility rules. Contact BA's Accessibility team before travel. Power outlets available in Club World (business class) and on some long-haul economy seats on newer aircraft (A350, 787).

Ryanair and easyJet

Both permit CPAPs in the cabin as medical devices on EU-regulated flights. Staff familiarity with the rules varies — carrying documentation is particularly useful on these carriers.

The Bottom Line

CPAP and BiPAP machines are protected by law in the US and EU — airlines cannot count them against your carry-on allowance or charge you for bringing them. Remove the machine at security, empty the humidifier water before the checkpoint, carry the power adapter that matches your destination's socket, and confirm power availability at your seat if you plan to use the CPAP during a long flight. A brief doctor's note is optional but worth having for international travel.