I've done a lot of traveling this year. With some airlines my 500's Porta Brace case is just fine, but with others it's too big.
Here was my solution:
Cinebags CB25 Backpack
-Camera Body, VF, Shotgun, Accessories, Batteries
-Pelican case for the lens
Pelican case fits under the seat in front of me, backpack fits in the overhead. **However, this won't work on a smaller commuter plane.
Happy Travels.
Ryan Pratzel
Executive Producer
Creative Liquid Productions
http://www.CreativeLiquid.com