I never had any problem with any stove (canister, pressurized, or alcool). What is attracting unwanting attention is the fuel bottle (i've had two bottles and one pump confiscated from my checked-in luggage, not all post 9/11!) No problem with alcool, at least as you can use any kind of container. I will now take my fuel bottle in hand luggage, and have it "hand inspected" at check-points, as it seem to be OK to have empty containers...(That is, next time I take a pressurized stove on a trip <img src="/forums/images/graemlins/shocked.gif" alt="" /> ).