Recently flew J from ICN to SFO. At some point during the flight, I fired up my iPad to check out if the movie choices were any different on the PDE. Obviously, had to join United wifi and was surprised to find that during a seatbelt announcement, the movie paused with a notification that a announcement was being made. Annoyed I couldn't get around the pausing with my own device, but even more impressed that they found a way to pause PDE via the wifi network.