I have T-Mobile as well. I get LTE pretty much everywhere except gate level in Detroit. I get it in the crew room basement but not anywhere else in the airport.. Go figure.

I hardly ever use airport/hotel wifi because they usually stink and T-mobile speeds are so much better (and unlimited).

Oh yeah, and their included international features are awesome too. Went to Greece for 2 weeks over the summer and had free 3G everywhere. Not fantastic, but enough to use google maps and find places to eat, etc.