I can take a gas cylinder pretty much anywhere I want to, but it's not wise to have one in an enclosed space (if it's leaking, it's going to become explosive wh

I can take a gas cylinder pretty much anywhere I want to, but it's not wise to have one in an enclosed space (if it's leaking, it's going to become explosive when the oxygen gas mixture hits a certain ratio). As for the metal fork on an airplane restriction, please don't ask anyone to try to explain the TSA's rationale (for that and most of their other policies).