If you are not in possession of printed boarding passes with your luggage accepted when the computer crosses the threshold set for that day you are toast. Unless you can find a way to accurately monitor the cut off times for your flight and can predict accurately when you will get to the front of the line. The guidance from the airline is to arrive in the building 3 hours before. 90 minutes seems to be the regular time to have your bags actually handed over with your boarding passes in hand.

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