Okay... this is odd. Sitting on N570UA right now (about to head SEA-SFO UA0468) and there's GoGo WiFi. N593UA isn't around, and I'm too far away from an AS plane to be leeching its signal.

Will report back once inflight if I can connect.

Edit: Turns out it must have been bleed from another aircraft. The closest AS plane was 3 gates away, so not sure if that's what it was. On the plus side, we had Capt Flanagan!