I was at PHX a week ago (4/29) - 2.30 pm -3 pm. Saw a 'different' airplane parked at a gate in the US Airways A Terminal.

Unlike the other US birds, this had a red/black/white Angry Bird logo on its tail.

Anyone know what airline flys this airplane, and any background?

US Airways?
Finnair (unlikely - not at an international gate AFAIK, but the Angry Birds game was invented in Finland)
Some other airline?

Registration of the bird was N837AW