Of course it is possible that sabotage was involved. An small explosive charge in the tail would have done it. The plane had just come out of service. Funny how they didn't release the actual voice recordings of the last few seconds of the flight, or even the supposed warnings of wake turbulence before take off, yet they did release the take-off clearance. Why only the transcripts for these other times? Call me a conspiracy thoerist, but you can bet your bottom dollar that if there was any information pointing towards this, it would have been extremely well covered up, given the timing after 9-11, to avoid national panic. Things are often simpler than they seem!