In reply to marsbar:
> (In reply to JoshOvki) It's more that it potentially looks like a bomb going through security screening than a physical problem.
Exactly. I lost a pump/bottle this way, though not the stove, flying Air Canada years ago. They just look at, it and it looks dangerous, so they take it - no questions, no facts needed, no amount of explanation will help, didn't even sniff it.
Now I completely separate the stove parts, sometimes even putting the stove, pump and bottle in separate bags. Leaving the pump in the bottle is just asking to have it taken.