Originally Posted by
Calculon
Another, albeit less likely, scenario is they were connecting from a separate ticket. But that just explains not passing through security (while also not being checked in). How they got on board is the more interesting question.
On my recent LAX-FLL red-eye flight on AA, two pax had the same seat. Turns out one of them boarded the wrong flight!! FA was shocked how gate agent let her pass and made it to the airplane lmao..