ABS Avalanche Airbags are generally permitted aboard an aircraft according to the general rules of IATA (International Air Transport Association). We highly recommend that you inform your airline about your ABS airbag at least 14 days before departure, or note it on your ticket at the time of purchase.

Bring a printed copy of the appropriate IATA documents and data sheet to present upon request at the airline’s check-in counter.

We highly recommend that you check-in your ABS backpack together with cartridge, handle and IATA table. 
For the airport staff it is important that cartridge and handle are linked to the ABS backpack. If you transport cartridge and handle seperately from your ABS backpack you run the risk that cartridge and handle will be removed from your luggage!

 
IATA Document

With the approval of the operator(s), one avalanche rescue backpack per person equipped with a pyrotechnic trigger mechanism containing not more than 200 mg net of Division 1.4S and a cylinder of compressed gas of Division 2.2 not exceeding 250ml. The backpack must be packed in such a manner that it cannot be accidentally activated. The airbags within the backpack must be fitted with pressure relief valves.