Flying with a Medical Device: Oxygen, CPAP, and Other Equipment Considerations
Key Takeaways
- Notify your airline at least 48–72 hours before departure about any medical device you're bringing aboard.
- A physician's letter is typically required for portable oxygen concentrators and may be needed for other devices.
- CPAP machines are generally exempt from carry-on limits, but confirm this directly with your airline.
- TSA allows FAA-approved medical devices through security checkpoints with proper documentation.
- Cabin altitude can reduce available oxygen — consult your doctor if you have a respiratory condition.
What you will need
Why Advance Planning Makes All the Difference
Flying with a medical device — whether a CPAP machine, a portable oxygen concentrator (POC), an infusion pump, or a cardiac monitor — is entirely manageable when you plan ahead. Airlines, security agencies, and airports each have their own procedures, and understanding them in advance removes the guesswork on travel day.
Cabin air pressure in a commercial aircraft is typically equivalent to an altitude of 6,000–8,000 feet. For most passengers this is imperceptible, but for travelers with cardiopulmonary conditions, reduced oxygen availability at altitude can be a genuine concern. If you rely on supplemental oxygen at home or have been recently treated for a respiratory condition, speak with your physician well before booking. They can assess your fitness to fly and advise whether in-flight oxygen is appropriate for you.
For broader guidance on what health information airlines may request, see our article on flying with a medical condition.
Always Consult Your Doctor Before Flying
If you rely on supplemental oxygen, have recently had surgery, or manage a serious cardiopulmonary condition, speak with your physician before booking your flight. They can determine whether you are fit to fly, whether in-flight oxygen is medically warranted, and whether a high-altitude simulation test (sometimes called a hypoxia altitude simulation test) is appropriate for your situation. This article provides general information only — it is not a substitute for personalised medical guidance.
What You'll Need Before You Fly
Gathering the right documentation before your trip is the single most effective step you can take. Here's what to prepare:
What you will need
Physician's Letter
Documents your medical need for the device and is typically required by airlines before boarding.
Portable Oxygen Concentrator (POC)
Provides supplemental oxygen during the flight for travelers with respiratory conditions; must be FAA-approved.
CPAP or BiPAP Machine
Maintains breathing therapy for travelers with sleep apnea; generally permitted as a carry-on medical device.
Extra Batteries
Powers your device independently of in-seat outlets; essential for flights without accessible power ports.
Distilled Water (small quantity)
Required for CPAP humidifier chambers; must comply with TSA liquid rules or be purchased after security.
Device Documentation Folder
A dedicated folder holding your physician's letter, device manual excerpt, and airline confirmation keeps everything accessible at security.
If you are also managing prescription medications alongside your device, our guide on medications and air travel covers packing and security rules in detail. For international trips, consider reviewing packing your medical documentation for international travel to ensure you have the right health records on hand.
Step-by-Step: Preparing to Fly with Your Medical Device
Follow these steps in sequence to give yourself the smoothest possible experience from booking through to landing.
Confirm Your Device Is Approved for Air Travel
Not all medical devices are cleared for use on commercial aircraft. Check your device's documentation or the manufacturer's website for an FAA compliance statement. POCs must appear on the FAA's accepted list; CPAP machines are generally permitted, but always verify with your airline. If you're unsure, your device supplier or prescribing physician may be able to help confirm approval status.
Obtain a Physician's Letter
Contact your doctor to request a letter on official letterhead. The letter should state your diagnosis, confirm the medical necessity of the device, specify the equipment model and serial number, and indicate any in-flight usage requirements. Some airlines have their own medical clearance forms — ask your airline's accessibility or special assistance team whether a specific form is also needed.
Notify Your Airline in Advance
Call your airline's special assistance line — not the general booking line — to declare your device. Do this at least 48–72 hours before departure; some airlines require longer notice for POC users. Confirm whether you need a specific seat (e.g., one with a power outlet), whether the device counts toward your carry-on allowance, and whether any additional forms need to be completed before you arrive at the airport.
Pack Your Device for Security Screening
At the security checkpoint, remove your device from its bag and place it in a separate bin for X-ray screening, just as you would a laptop. Inform the TSA officer that you are carrying a medical device. If the device cannot go through the X-ray machine — which is rare but possible — request a hand inspection. Carry your documentation in an easy-to-access pocket of your carry-on rather than checked baggage.
Plan for Power and Battery Needs Onboard
If your device must run continuously during the flight, calculate your total battery needs based on the full flight duration plus any delays. Many airlines recommend carrying batteries sufficient for at least 150% of the scheduled flight time. Check whether your seat has an in-seat power outlet before booking — seat maps and airline customer service can both help. If no outlet is available, ensure your batteries can cover the entire journey independently.
Arrive Earlier Than Usual
Travelers with medical devices often benefit from arriving at the airport 30–45 minutes earlier than they typically would. This extra time accommodates any secondary security screening, gate conversations with airline staff, and boarding early — which many airlines offer to passengers with medical needs. Early boarding gives you time to stow your device safely without the pressure of a crowded aisle.
At the Airport and Onboard
Arrive earlier than you normally would — at least 30 minutes beyond your usual buffer — to allow time for any additional security screening. TSA officers are trained to handle medical devices, but you may be directed to a separate lane for inspection. Remain calm, present your documentation proactively, and ask for a private screening room if you prefer one.
Onboard, store your CPAP or POC under the seat in front of you for quick access. If you use a POC, confirm before boarding that your seat has an accessible power outlet if the device requires one, and carry fully charged batteries as a backup. Airlines are not required to supply in-seat power, so battery capacity is critical for longer flights.
If you also travel with a mobility aid, the guide to mobility aids on planes explains how to coordinate multiple accessibility needs with your airline. Additional resources are also available through our Mobility & Accessibility hub and the Senior Flight Guide.
This article provides general travel information only and is not a substitute for personalised medical advice. Always consult a qualified healthcare professional regarding your fitness to fly and the management of your specific medical condition or device.