Ex PanAm pilot here 1968-1991.
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The correct "PanAm 3 killers" are
TRIM FLAPS SPOILERS...
These are 99% of the reason of takeoff incidents and accidents.
Everytime I line-up for takeoff, I verify the 3 killers.
In my career (retiring in 3 months) - it saved my neck TWICE...
Twice flaps were UP - yet check-list had been properly completed as per SOP.
There are NO guarantees that the takeoff warning horn will operate.
You might forget other items... i.e. pitot heat... that will make you crash 10 minutes later but T/O will be ok.
xxx
In this sad accident, what I gather so far from "extracting" valid information, it looks that this aircraft was not configured (slats/flaps) and flew at rotation in "ground effect" to some 50 ft AGL, then stalled - maybe even got engine compressor stall as well at that time. Did their T/O warning horn fail...?
xxx
P.S. I think the "FET" FLAPS ENGINES TRIM goes back to the DC-6/7 days.
Happy contrails