I was on this plane a month before it disappeared. The plane left 6 hours late due to equipment problems (issue closing the rear door). At one point economy passengers started to riot and armed security people came on board.

Arriving late into Beijing I missed my American flight in first class and had to settle for United business. Although we landed at ORD, the airport was shut down due to temperature (-17 F) and snow. Not the best way to end a trip.