Most of the rooms have LG Flat panels. I do believe at Pop ours had an extra HDMI port. Composite, not so sure. I do remember my husband commenting on the HDMI though.
I wouldn't count on the wifi. It's not fast or reliable enough.
Also, some airport security can be pains about taking consoles (we know from experience). We've had to take them out (because I'm not putting them in checked lugagge) and turn them on for them. It can take a little time.
If he has a handheld, I'd recommend bringing that instead. Both my husband and I always do. No plugs needed! We'll be battling each other in Smash Brothers our whole flight. Going to whomp him good!