Thanks to one of those people that got lost, didn't get on the flight and had to have their bags removed, my flight was cancelled!
It was Delta JFK to Mexico City. We had been delayed four hours due to mechanical issues. Once we boarded "Mrs. Su" couldn't be found and had to have her bag removed. Well, that too a lot of time and, as we were now approaching 3 PM and would arrive in Mexico City after sundown Friday, a family of Orthodox Jews needed to get off because they couldn't fly. This of course delayed us further because THEIR bags had to be found and removed. By the time we were ready to leave, the crew timed out and another couldn't be found.
We left the next morning. Thank you Mrs. Su!