My opinions from flying and I'm not lying.....
Buy a Pelican 17 series. For one, the resale on the case is great. The Plano will always be yours, it has no resale. I'll up the anty to 120 bucks when you get back and I'm closer to you and I'll pay the shipping (to me), provided you buy a black case. I don't like the green and the tan reminds me of Iraq.
Plano moulding makes good cases, I have a couple, good for going to the range or a drive to hunt IMO, not airline cases though some are 'airline (TSA) approved'.
Here's the rub. The baggage jockeys are going to use your rifle case for volleyball, I guarantee it. It's gonna get kicked, slammed, stepped on and probably slam dunked. The Plano won't take the abuse, your rifle won't take the abuse. You want a successful hunt or you want to get out there and find out your rifle is shooting around the corner......
You'll also need TSA 'approved' locks that you can get at Staples or online. get 3 or 4, keyed alike. The TSA approved locks can be opened with a key that the TSA agent has and they are chintzy cheapo locks. I know, I fly with firearms.
Pack your ammo in a carry on bag or in your luggage seperate from your rifle, thats what I do at least and have a contigency plan if your rifle don't arrive with you, thats happened to us before. We went to Denver and the rifles went to Salt Lake.
The Pelican has features that the Plano wishes it had (and those features make it resale valuable), like altitude compensating pressure relief and waterproof 'O' ring seals and real stainless steel lock plates and roller bearing wheels. You can use a Pelican for a life preserver (if the plane goes down) and your rifle will stay dry, safe and best of all, it will shoot just like it did when you put it in the case.
Thats what quality is all about. You pay for quality, however, it has resale. The Plano will be landfilled long before the Pelican will be retired, if ever.
I'm not usually so adamant about things, but in this case, I'm offering sound advice, from experience.
Your other option is a Cabelas Aluminum Airline case but it will look like hell in short order (from the abuse the baggage jockeys inflict on it) and it's as expensive as the Pelican, maybe a bit more. One of our group has one and it looks like it's ready for the scrap yard after 3 hard years. It has resale value as well.... Scrap value.