To the original poster:
Somehow, unless you're driving and can take it along with you, traveling with an iMac -- particularly via air -- doesn't seem like that great an idea, at least to me.
Isn't this what laptops were designed for?
Ever think about buying one?
Alternative scenario:
- Get a Mac Mini, whichever one suits you.
- Pack the Mini (along with mouse & keyboard) in your checked luggage
- Buy a cheap monitor at the location you're going to, or perhaps borrow or even rent one.
A mini is small enough to be packed almost anywhere....
... all of this seems a lot less troublesome than trying to drag an iMac along, even in a hard case in checked baggage. You _ain't_ gonna be carrying that onboard with you!