Hmmm. It’s way too early to know what caused the SFO crash on 28L today.
But..I suspect (ILS was out on 28L) that he got way too low too soon, got
within 50’ of the surface, had autothrottles on which pulled the throttles
to idle and the pilot let that happen but rotated to get to the runway and
hit the tail on the lip before the runway.