Radar reconstructions performed after 9/11 reveal that FAA radar equipment tracked the flight from the moment its transponder was turned off at 8:56.
( ( ( Radar reconstructions ) ( performed ( after 9/11 ) ) ) ( ( reveal ( that ( ( FAA ( radar equipment ) ) ( ( tracked ( the flight ) ) ( from ( ( the moment ) ( ( its transponder ) ( was ( ( turned off ) ( at 8:56 ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Radar) (NNS reconstructions)) (VP (VBN performed) (PP (IN after) (NP (CD 9/11))))) (VP (VBP reveal) (SBAR (IN that) (S (NP (NNP FAA) (NN radar) (NN equipment)) (VP (VBD tracked) (NP (DT the) (NN flight)) (PP (IN from) (NP (NP (DT the) (NN moment)) (SBAR (S (NP (PRP$ its) (NN transponder)) (VP (VBD was) (VP (VBN turned) (PRT (RP off)) (PP (IN at) (NP (CD 8:56))))))))))))) (. .)))
The flight was tracked by the radar before the tragedy.
( ( The flight ) ( ( was ( ( tracked ( by ( the radar ) ) ) ( before ( the tragedy ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN flight)) (VP (VBD was) (VP (VBN tracked) (PP (IN by) (NP (DT the) (NN radar))) (PP (IN before) (NP (DT the) (NN tragedy))))) (. .)))