Had to be a Yank.
I dont suppose he thought it a bit odd that the flight from Gatwick to 'Granada' had cost him $4500!
No doubt he must have been watching the departures screens, and also must have seen the destination at the gate, but being a bit geographically challenged, didnt notice it was the wrong destination.
Best just blame the agent who sold him the tickets when he mispronounced his required destination then.
Smacks of Tomaytoes tomatoes to me.