A nice soft case is better for airline travel than a hard case. Airline monkeys tend to throw and are purposely hard on hard cases because they can "take it". They are also put on the bottom of the pile in the belly of the plane.

I use an SKB soft double bow case... same case that Mathews sells w/ their name embroidered on it. It's a very nice case and has lots of storage.

Also might want to take a look at the new Brownell and Aurora soft bow cases.

I personally don't like the bulkiness of the hard cases.. esp for everyday/normal use. They are very bulky and hard to manage. I almost bought one of the Roto cases from SKB.. but it was a pain to operate.. and REALLY bulky.