I've been flying with my bass 5-10 times a year for the past 3 years. Fortunately my basses have survived up to this point. SKB has been great.
The Pro Rectangular Electric Bass Case (Model: 1SKB-44PRO) Did me well for about a dozen flights. Finally the luggage killers dropped from their highest height and smashed the corner. The case was still usable but it wouldn't stand on edge when I set it down.
I upgraded to the iSeries Waterproof ATA Bass Guitar Case (Model: 3i-5014-44) and i dont forsee anything every destrpying that thing.
Note that I always pack my bass securely in the case. I use my travel clothes to pack and pad it. In addition to taking some tension off the strings, I support the neck with underwear, wrap the headstock in a shirt, pad round the headstock with more rolled up clothes, put another shirt between the strings and fretboard, and carefully wad socks and underwear around the body to pad and secure it. My basses aren't Fenders so they don't fit the cases exact. Saves me luggage and keeps my bass secure. Been all over the US, Canada, Mexico and Europe this way. Only downside is if you don't get a chance to unpack before you have to play a gig, like airport directly to festival, your sock sand underwear get to come out on stage. Its good for a laugh.