how would anyone know if it is a slim chance or not? the ATC may not know till the minute to tell the airline you have to leave now or you will have to wait even longer, due to another plane that was due was being held up (mech issues, bags not all on board, etc) so they may not know until the sec, and if people were in the terminal there is a missed chance, and if people knew they could have left than they would be ****** coz it meant they would be waiting longer and still have no idea when they would be leaving
alot of the time the plane pulls back and than they are told to hold, they follow ATC rules and what they are told
however, if they know that it will be a long period and no chance of being able to take off in a tight window, than maybe they should allow passangers back into the terminal, only if there is no chance that they have the opportunity to leave
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