Exactly.Plano protektor, works good, costs little. Its a bit bulky though...
I know the better ones pay off, but I am 17 and right now I cannot afford to spend $250 on a case.Plano says that one is airline approved, but I wouldn't trust it. The Plano case I had was a brittle plastic. There is no padding above the bow when it's closed. The arrows could easily come loose when baggage handlers are throwing it around.
Why make such big archery plans with nice bows and skimp on the case? A really good case will pay for itself in time since you won't go through multiple cheap cases.
The SKB cases are great (and they come with an insurance policy). If you like softer cases the Aurora cases are very nice. I got an Easton Navigator soft case for traveling to tournaments by car. It's a great case for ~$100, but I haven't flown with it yet.
My SKB rode to northern Quebec and back and has flown multiple times. Never had a problem with stuff on the inside, but the outside has it's fair share of scratches