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I haven't observed any mechanism that checks or counts the passengers who get on the aircraft, so there is a possibility of abuse.
Absolutely not, passengers on board are 100% accounted for. You haven't noticed it because it's not done in a very noticeable manor unless there's a problem.
This previous thread addresses this situation:
What happens depends on the exact situation. If someone mistakenly boards the wrong flight (yes, it can happen) they're just sent off to their correct flight. If they're found to be a stowaway, they're probably arrested by the airport police.
Note, particularly for US domestic flights, there is no safeguard against switching boarding passes since ID's are not regularly checked at the gate. This presumes thought that a valid Boarding Pass and ID were used at the terminal entrance.
Upvote:0
It depends on the airport and the country. In Canada, ID is checked at boarding, so a passenger couldn't easily board the wrong flight. A passenger could theoretically spend the day in airport security and not be detected if he didn't board his flight, but there is no harm in this anyway. (It is perfectly possible to get a gate pass to help take a passenger to his gate, without having a flight for yourself - it would be very unlikely that anyone would force such a person to leave the secure area if he wanted to explore the shops and restaurants.)
Upvote:1
Strange that it wasn't mentioned: What you describe would be something that a person would do who has a ticking timebomb in their luggage. So the flight would be delayed until the identity of the missing passenger is confirmed, and either the missing passenger is found and brought back on board, or the missing passenger's luggage is removed.
That happens when passengers check in luggage and then don't check in themselves, but the same reasoning would apply if you checked in and then somehow managed to not board the plane.