The new x-ray machines that checked baggage goes through will ruin undeveloped film. Now they usually ask you if you have film in your checked bag & suggest that you take it out while your bag goes through. Higher speed film (800) has more of this problem than lower level film (200). Regular x-ray for normal TSA walk-through to get to the gates won't hurt it. It's a crapshoot on the Euro side if they'll let you do the hand-over as you go through. When I came back from Russia, it was no. And I haven't had film w/ me the last few times in Amsterdam because I was there on bizness, so not sure about them. When in doubt, call the airlines before going & get the update on the film situation.