What the other posters said is correct - 800 speed and higher can be damaged. But don't put any film in your checked baggage. If you are really worried, you can request your film and camera be searched by hand, but expect to have a thorough - and I do mean thorough - search of you, your carry ons, shoes, undergarments (esp. underwire bras), etc., searched. It will add quite a bit of time on to your airport security screening. We have travelled numerous times with our film in carry on bags with no problem.