Never, ever check your camera gear if you want it back!
Besides, if you check it, how are you going to take in-flight photos? I'd never fly without my camera. OK, you have to stow it for takeoff and landing but if you have a window seat you can spent the entire flight looking for interesting landmarks, cloud formations, sunsets, other planes etc to take photos of...
Do yourself a favour and get a rubber lens hood (Precision Camera in Austin have them for about $5) - they screw in like a filter and protect the window glass from getting scratched when you get into turbulence and the lens bounces off the window. Yeah, it happens no matter how careful you are. And you have to be lucky that you get a window that isn't too scratched from all the other people before you ;)
Here's a 747 cargo conversion a few hundred feet below us, somewhere in Paris airspace, taken with the long end of a 28-135mm lens, my usual workhorse. It's never going to win the Pulitzer prize but it's fun to get these:
