NTSB's Hersman and Cedore: (summary) No problems with the black boxes; "end scars" at the end of 26, "preliminary data" that aircraft was lined up 26 on takeoff.
"Debris field is several hundred feet extending from runway." "Lined up and took off from 26." "It did go through the perimeter fence." "Scar marks are consistent with the aircraft impacting the ground."