Since the tragedies of September 11th, the Department of Transportation has limited carry-on luggage to one piece plus a personal bag such as a purse or briefcase. However, the Department of Transportation has noted that the new "limit of one carry-on bag and one personal bag (e.g., purse or briefcase) for each traveler does not apply to medical supplies and/or assistive devices."
The CPAP is a medical device and as such it has never been advisable to check it as luggage (it may be damaged or lost), and it is important to your health to use the CPAP every night, even if you will be away from home for even just one night. Click to read the DOT Fact Sheet Steps Taken to Ensure New Security Requirements Preserve and Respect the Civil Rights of People with Disabilities. You may want to print out the fact sheet to show to airport security personnel.
