A Traveler’s Guide to Flying with a CPAP Machine

For individuals who rely on Continuous Positive Airway Pressure (CPAP) therapy, air travel can raise questions about airport security, carry-on rules, battery requirements, and using a CPAP device during a flight.

Fortunately, traveling with a CPAP machine is common, and a little preparation can make the process easier. In the United States, CPAP machines are recognized as assistive devices under Department of Transportation (DOT) air-travel regulations.[1]

This guide covers what to know before you fly, including TSA screening, airline requirements, battery considerations, packing tips, and using a CPAP machine onboard an aircraft.

Your Rights When Flying with a CPAP Machine

In the United States, the Air Carrier Access Act (ACAA) and Department of Transportation regulations under 14 CFR Part 382 establish protections for passengers traveling with qualifying assistive devices.[1,2]

CPAP machines are specifically identified by the DOT as assistive devices.

Does a CPAP Count as a Carry-On?

A CPAP machine that qualifies as an assistive device generally does not count against your carry-on baggage allowance.[1]

You may typically stow the device:

• In an overhead compartment

• Under the seat in front of you

• In another approved cabin storage area when available

There is an important distinction when packing your CPAP. If a bag contains both your medical equipment and unrelated personal belongings, the airline may count that bag toward your normal baggage allowance.[1]

For that reason, keeping your CPAP and its necessary accessories together in a dedicated travel case can make traveling with the device simpler.

Airline policies and international regulations may vary, so always confirm requirements with the airline operating your flight before departure.

Navigating the TSA Security Checkpoint with a CPAP

CPAP machines are routinely screened at U.S. airport security checkpoints.

Current Transportation Security Administration (TSA) guidance states that nebulizers, CPAPs, BiPAPs, APAPs, masks, and tubing may remain inside their carrying case during X-ray screening, although a TSA officer may ask that the device or components be removed for additional screening.[3]

Tips for TSA Screening

Keep your equipment organized.
Keeping your CPAP, tubing, mask, power supply, and accessories together can make the screening process easier.

Be prepared for additional screening.
Even when an item is generally permitted, TSA may perform additional screening when necessary.

Tell the TSA officer if you have questions or concerns.
If you are concerned about the screening of your medical equipment, speak with a TSA officer before screening begins.

Consider carrying supporting documentation.
A prescription is not generally required simply to take a CPAP machine through TSA screening, but keeping a copy of your prescription may be useful while traveling, particularly on international trips.

If your CPAP is approved for use aboard an aircraft, you may also want to carry the manufacturer's air-travel compliance documentation.

Packing Your CPAP for Air Travel

Whenever practical, keeping your CPAP machine with you in the aircraft cabin can reduce the risk of the device being lost, delayed, or damaged with checked baggage.

Make sure you have all of the components required for your therapy before leaving home.

CPAP Air Travel Packing Checklist

CPAP Battery Rules for Air Travel

Battery requirements deserve extra attention when traveling with a CPAP.

FAA rules vary according to the type and capacity of the battery. For lithium-ion batteries:

• Batteries rated at 0–100 watt-hours (Wh) are generally permitted on passenger aircraft.

• Batteries rated at 101–160 Wh generally require airline approval, and quantity limits apply.

• Lithium-ion batteries exceeding 160 Wh are generally prohibited on passenger aircraft except under certain separate provisions that do not ordinarily apply to CPAP travel.

• Spare or uninstalled lithium batteries must be carried in the aircraft cabin rather than checked baggage.

• Spare battery terminals must be protected from short circuit.

• Damaged or recalled lithium batteries should not be carried aboard an aircraft unless they have been made safe in accordance with applicable requirements.[4]

Individual airlines may impose additional restrictions, so always check your battery specifications and your airline's current requirements before traveling.

The 150% Battery Rule

If you intend to use your CPAP during the flight, the airline may require you to carry enough fully charged battery capacity to power the device for at least 150% of the expected maximum flight duration.[1]

For example, if an airline applies this requirement to a six-hour expected flight duration, you would need sufficient battery capacity for at least nine hours of operation.

Battery runtime can vary based on the device, therapy settings, environmental conditions, accessories, and other factors. Use the manufacturer's battery-runtime information and your airline's requirements when planning your power needs.

Using Your CPAP During a Flight

Many travelers choose to use their CPAP machine during overnight or long-haul flights.

If you plan to use your CPAP onboard, advance planning is especially important.

1. Contact Your Airline Before Travel

Airlines may have their own procedures for the onboard use of respiratory assistive devices.

Under DOT rules, an airline may require advance notification for onboard CPAP use. Some airlines may request notification 48 hours or more before departure.

Contact the airline operating your flight and ask specifically about:

• CPAP use onboard

• Device documentation

• Battery requirements

• Advance-notice requirements

• Seating or storage restrictions

• Power availability

For codeshare flights, requirements may be determined by the airline actually operating the aircraft.

2. Bring an Appropriate Independent Power Source

Do not assume that an electrical outlet will be available or suitable for powering your CPAP.

Onboard electrical availability varies by airline and aircraft. Some airlines do not permit their outlets to be used to power medical devices, while others may allow their use when compatible power is available.

A compatible independent battery that meets applicable airline and FAA requirements can provide a dedicated power option for CPAP use during the flight.

3. Check Battery Capacity Before Departure

Make sure your battery is fully charged and that you have enough capacity to satisfy the requirements of your airline.

If your airline applies the 150% rule, calculate your required battery capacity before arriving at the airport.

4. Follow the Manufacturer's Instructions

Always operate your CPAP according to the instructions supplied with your specific device.

Do not change prescribed pressure settings or other therapy settings simply for travel unless instructed to do so by your qualified healthcare provider.

What About CPAP Humidification on an Airplane?

Humidification requirements differ among CPAP devices.

If your device includes a heated humidifier, review the manufacturer's instructions and the airline's requirements before attempting to use the humidifier onboard. Heated humidification can also increase power consumption and affect battery runtime.

Some CPAP systems offer compatible Heat and Moisture Exchanger (HME) options that provide waterless humidification without a traditional water chamber.

For example, the Transcend AirMist™ HME provides a waterless humidification option compatible with designated Transcend Micro configurations.

Always use accessories according to the manufacturer's instructions.

Traveling with the Transcend Micro and Transcend Micro 510

The Transcend Micro™ and Transcend Micro™ 510 are FAA compliant for onboard use based on testing documented by Transcend.[6]

Transcend's February 2026 FAA Compliance Letter states that the listed Transcend devices comply with RTCA/DO-160G, Section 21, Category M requirements and are considered FAA compliant.[6]

Because individual airline requirements may vary, Transcend recommends checking with your airline before travel. Some airlines may require advance notification and may have specific battery requirements.

Travelers may want to print or save a copy of the current Transcend FAA Compliance Letter before departure.

Using a Transcend Micro on an Aircraft

The Transcend Micro User Manual states that the device meets FAA requirements for use on an aircraft.[5]

When using the Transcend Micro onboard, follow the instructions in the User Manual. These include:

• Disable Bluetooth while onboard as instructed in the User Manual.

• Do not use the MySleepDash™ app while operating the device on the aircraft.

• Use the device's Start/Stop button to begin therapy.

• Follow all flight-crew instructions regarding the use and storage of electronic devices.

Refer to the current User Manual for complete operating instructions.

Airline Policies Can Vary

Airline requirements for CPAP machines are not identical.

One carrier may require an independent battery for onboard CPAP use, while another may permit the use of an available electrical outlet. An airline may also require advance notice, specific device documentation, or enough battery capacity for 150% of the expected flight duration.

Because policies can change, always check the current medical-device policy of the airline operating your flight before traveling.

This is particularly important for international flights, codeshare itineraries, and trips involving multiple airlines.

Frequently Asked Questions

Does a CPAP Machine Count as a Carry-On Bag?

Generally, no.

Under U.S. Department of Transportation rules, a CPAP machine used as an assistive device does not count against the passenger's carry-on baggage limit.[1]

However, if the same bag contains unrelated personal items, the airline may count that bag toward your baggage allowance.

Do I Need My CPAP Prescription at the Airport?

A prescription is not generally required simply to take a CPAP machine through a TSA security checkpoint.

However, keeping a copy of your prescription may be useful while traveling, particularly when traveling internationally or if questions arise about your medical equipment.

Check requirements for your destination and airline before departure.

Can I Travel with Distilled Water for My CPAP?

TSA's standard 3-1-1 liquid restrictions apply to most liquids in carry-on baggage. TSA also permits medically necessary liquids in quantities greater than 3.4 ounces when properly declared and subjected to applicable screening procedures.

However, TSA's specific CPAP guidance should be reviewed before traveling with water intended for a CPAP humidifier, and screening decisions ultimately rest with TSA at the checkpoint.

To simplify travel, some CPAP users choose to travel with an empty humidifier chamber and obtain distilled water after security or at their destination.

If your device supports a compatible waterless humidification option such as an HME, that may provide another option while traveling.

Are CPAP Batteries Allowed on Airplanes?

Many CPAP batteries are permitted, but the applicable rules depend on battery chemistry, capacity, and airline requirements.

For lithium-ion batteries, the FAA generally permits batteries up to 100 Wh. Batteries between 101 and 160 Wh generally require airline approval. Spare lithium-ion batteries must be transported in carry-on baggage and protected from damage and short circuit.[4]

Always verify the specifications of your particular battery before traveling.

Do I Need to Tell the Airline I Am Bringing a CPAP?

Simply carrying a CPAP and using one onboard are different situations.

Airlines generally allow qualifying assistive devices to be transported without counting them against the normal carry-on limit. However, if you intend to operate your CPAP during the flight, the airline may require advance notice or additional documentation.

Contact the operating airline before travel to confirm its requirements.

Can I Plug My CPAP into the Airplane's Electrical Outlet?

Possibly, but you should not depend on it.

Electrical outlets vary by aircraft and airline, and some airlines do not permit onboard outlets to power medical devices. Other airlines may allow their use when an appropriate outlet is available.

If you plan to use your CPAP in flight, check with your airline and consider an appropriate independent battery source.

Important Safety Information

The Transcend Micro provides positive airway pressure for the treatment of obstructive sleep apnea (OSA) in adults weighing more than 66 pounds (30 kg). The device is intended for home and hospital/institutional use.[5]

In the United States, federal law restricts the device to sale by, or on the order of, a physician.[5]

Always use your CPAP according to your prescription and the manufacturer's instructions. Before using the Transcend Micro, review the User Manual for its indications for use, contraindications, warnings, precautions, adverse effects, setup instructions, and operating information.

Disclaimer

The information provided in this article is for general informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Always consult your physician or another qualified healthcare provider regarding your CPAP therapy and follow your prescribed therapy settings.

In the United States, federal law restricts the Transcend Micro to sale by, or on the order of, a physician. Please review the official Transcend Micro User Manual for indications for use, contraindications, warnings, precautions, adverse effects, operating instructions, and other important safety information.

Airline, airport-security, battery, and international travel requirements may change and may vary by carrier, aircraft, destination, and jurisdiction. Always confirm current requirements with your airline, the TSA or applicable security authority, and relevant aviation authorities before traveling. References and airline policies should be reviewed periodically to ensure information remains current.

References

1. U.S. Department of Transportation. Assistive Device – Stowage, Damage, and Delay. Includes guidance identifying CPAP machines as assistive devices, carry-on treatment, and requirements that airlines may impose for onboard CPAP use.

2. U.S. Department of Transportation. About the Air Carrier Access Act. 49 U.S.C. § 41705 and Title 14 CFR Part 382.

3. Transportation Security Administration (TSA). Nebulizers, CPAPs, BiPAPs, and APAPs. Current TSA security-screening guidance for PAP equipment.

4. Federal Aviation Administration (FAA). Airline Passengers and Batteries / PackSafe. Current guidance regarding lithium-ion batteries, spare batteries, watt-hour limits, and carry-on requirements.

5. Transcend Inc. Transcend Micro User Manual, 104149 Rev F. Includes indications for use, prescription status, safety information, and instructions for traveling by airplane.

6. Transcend Inc. FAA Compliance for Transcend Devices, February 13, 2026. Identifies the Transcend Micro and Transcend Micro 510 among devices complying with RTCA/DO-160G, Section 21, Category M and considered FAA compliant.