Wouldn’t the failure of the passenger to reboard be noted at the gate?
Not everybody de-boards during layovers. I don’t believe they keep track of those who do.
“Wouldn’t the failure of the passenger to reboard be noted at the gate?”
Yes, and it happens every day, on every flight. Plans change, or some people book multiple itinerary’s to insure they can leave when they want to.
The airlines PLAN for a certain number of no-shows. It’s called “Yield Management”.