The hijackers on those flights had waited no more than 30 minutes to commandeer the aircraft, most likely striking after the seat-belt sign had been turned off and cabin service had begun.
Kaprerne på disse tre fly havde ikke været mere end 30 minutter om at overtage kommandoen, sandsynligvis lige efter at signalet om at have sele på var slukket, og kabinepersonalet var begyndt at servicere passagererne.