wrong flight
Some years ago I flew Delta from JFK to MAN. During the long taxi at Kennedy the flight track appeared on the sceen showing a big arc over the atlantic to the UK. A noise erupted from economy and two oriental gentlemen came rushing forward. The two pax were ticketed and paid the fare from Seoul to Man. They wanted to go to Manchester New Hampshire. A long delay ensued and two very embarassed gentlemen were offloaded. Nobody but the Korean travel agent at fault but if they had checked their itin a 7hr sector from NYC to New Hampshire should have been a clue.