On the SFO airport guide Qantas advises "Passengers must check-in at least 3 hours before departure." Does anyone know if this is a strict rule? I have meetings beforehand and had planned to arrive 2.5 hour or 2 hours before departure for QF74 - does this mean I will not be able to check in? Three hours seems like overkill, even despite long TSA queues at times in US airports