What happens when you miss your flight due to screening? I mean if you really had to wait for over 30 minutes for a domestic flight and did not book any expensive ticket which allows rescheduling. Are you allowed to catch the next flight or do you have to buy a new ticket.
Furthermore, how do airlines handle your baggage. They won't know that your too late until everybody is in the plane (because you are already checked in). As far as I know, they may not fly with your baggage if you're not in the plane. So if I was late, wouldn't it delay the flight another 20 minutes to find my bags?
The airlines usually reschedule you for the next flight. However, your baggage gets sent on the original flight anyway. It is held in the destination airport's baggage office until you get there on the later flight.