I haven't had any difficulty traveling with either my rifle or shotgun. Fellow flyers at SEATAC can get whizzed out kinda easliy when waiting in line and they see my gun case. When I've checked in the airlines have been verra helpful. I wait to lock my case until it has gone thru the inspections. ( Much easier than taking it in locked, unlocking and relocking it). I don't fly with amo anymore since I had to send it back with my ride once. Just easier to pick up when I get there.
Have a great trip and best of luck.