Oh dear - this is going to get very technical! The problem hangs on whether the fuel stored in gas lighters is a gas or a liquid. Well in fact, as we all know it is a gas which is stored at high pressure at room temperature and under the laws of Physics that means that it liquefies. It's got to be a liquid because it has a surface. Now, argue all you like, but you can bet that some highly trained hostie or "jobsworth" will not even understand the nicities of this and whether your lighter does in fact contain gas or liquid fuel - they will nick your expensive Ronson (so that they can have a crafty one in the galley on turnaround) and you will never see it again. As has just been said - give up smoking, problem disappears! <img border="0" title="" alt="[Smile]" src="smile.gif" />