I've traveled w/ mine on a plane and they do pretty well. Wylie doesn't mind the crate, however, with Marcel we have to tranquilize him as he *hates* being in the bag. Is yours okay already w/ the travel bag? If not, PRACTICE a lot and get him comfy.
Btw, I always place a soft frozen gel-pack in their travel bag (under a cloth) to try to keep them cool on the plane, which can get hot sometimes underneath the seat, ya know?
This is a good thread for you to read too:
http://www.yorkietalk.com/forums/tra...you-bring.html