I just got off UA 1552 SAN-EWR. As we were preparing for landing the passenger beside me turned on his phone and asked "Are we landing in New York?". He was flying to Houston and had got on the wrong plane. His flight was supposed to have left from the gate beside us in SAN. Ironically our flight was full and his seat number for SAN-IAH was the only empty one on our flight.

How can this happen in 2013? Especially as they seemed to have extra security in place in the SAN airport this morning.