Если ходить по первоисточникам, то в правилах IATA написано следущее.
Passenger Dangerous Goods Corner
http://www.iata.org/whatwedo/cargo/dgr/Pages/dgr-guidance.aspx

I am a sailor / pilot / skier and I want to travel by air with my life vest / parachute / avalanche rescue backpack. Are there any exceptions?
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A single (1) avalanche rescue backpack per person are authorized containing a cylinder of compressed gas in Division 2.2. They may also contain an explosivetrigger mechanism containing less than 200 mg net of explosives in Division 1.4S.
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For items that are acceptable only with approval from the airline, consult with your airline well in advance and also allow additional time for check-in.
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Вообще тема из года в год поднимается, большинство провозит, а кто-то упирается в тупость авиакомпании. Хотя, сейчас и воду вон в салон нельзя вдруг стало...

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