Booked a trip with my AS miles from BCN to SEA via DUB. Was in a restaurant and had just ordered when I got a notice on my phone our flight was departing at 2pm (it was 1:50pm) we freaked out, crammed a bit of food and raced to the gate only to fine the plane was actually departing at 4pm. We sat at the gate with 6 others that also got that notice and raced to the gate only to find we each had plenty of time. sigh. One other time at SEA, I had a QX flight to EAT that was delayed so I took my client who was flying with me to the board room (it wasn't the lounge back then). We strolled back to the gate at 10 minutes before the stated new departure time only to find out the mx had been fixed and the plane had taken off. Thank goodness there was a later flight! (EAT is a small regional airport, and AS is the only airline to fly to them) But, my lesson was learned, never leave the gate if there is a mx.