a bomb threeat grounds two 747s in the canary islands and when the klm take off they hit the other 747 a pan am killing 583 people (All on klm 61 survive on pan am). the cause was the klm were worried about the work hours leading to them rushing the takeoff run and ignoring warnings that another plane on the runway combined with one bad timed call from the pan am.
next time a 737 stops safely at a gate and than something crazy happens.