Once you are not boarded 10 minutes prior to departure, you are removed from being checked in. At that time stand-by passengers (revenue and non-revenue) are processed. Once the boarding door closes, the flight is closed. That means all paperwork has been printed and is on the way to the captain or is already in the hands of the captain. I know it sounds easy to just open the door and let someone on, but that means you have to be re-checked in, new paperwork has to be printed and taken to the captain. Nothing can be hand written like the old days, it all has to be computer generated...and that takes time. The door has to then be closed 4 minutes prior to departure so the captain can get clearance and push on time.
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