You are correct. Regular airlines do not allow both of those (I.e. Alaska Airlines). The bush pilots typically do not allow the jetboil canisters either. Most folks coming in from the lower 48 (and can get to their hunt area without bush planes) will buy them locally.
Otherwise, your best choice is to use a MSR Whisperlight International and bring locally purchased white gas (most efficient). The international version will burn diesel and regular gas in a pinch.
As far as the bear spray - not sure about bush planes.