Depends how much your camera cost. Check it and you run the risk of it a) being stolen b) being damaged c) being lost forever. Mine always comes into the cabin with me and is normally loaded. Never had any film problems (up to 100 ASA) and I'd say about 60% of the time it passes the X-ray with no fuss. Do watch closely if they hand-search it, I once stopped one dolt just as she was about to open the back !
[ 26 October 2001: Message edited by: PaperTiger ]