As many of you know, the airbag is a new standard in avalanche safety. Airbags are allowed to be carried onto flights however the canisters must be empty. Most helicopter skiing operations can refill your canisters for you however we advise you to check with them prior to your travel. It is not an air carrier decision in regards to the canisters. It falls solely on the TSA agents during screening. The recommendation from HSUS is to simply ask your chosen operator if they can supply you with a canister or refill them for you. Many operators have airbags available upon your arrival if you choose to utilize one.
Here is the link to TSA for your information: