ABOUT FLAPS:
AFAIK, the flaps selection (in the whole calculations for TO procedure) in this bird is very variable, depending -mainly- on weight, runway lenght, wind, temperature and other parameters.
It would be good if anybody could tell specific experience and opinion about this subject and if it's POSSIBLE the crew had selected FLAPS 15 in this TO.
Provided flaps were deployed, it's almost impossible to have selected 30º and crashed in a matter of seconds after TO with flaps 0º...