One time I accidentally went to the wrong airport (Newark instead of JFK). A stern but kind lady at the checkin counter gave me a disapproving look, and proceed

One time I accidentally went to the wrong airport (Newark instead of JFK). A stern but kind lady at the checkin counter gave me a disapproving look, and proceeded to put me on the airline's next flight (leaving about the same time as from the other airport) without batting an eyelash. Being so used to battling the rigid bureaucracy of international flight and US immigration, I was floored by how flexible at least this one piece of the system turned out.