At 9:03, they would see another aircraft strike the World Trade Center.
( ( At 9:03 ) ( , ( they ( ( would ( see ( ( another aircraft ) ( strike ( the ( World ( Trade Center ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 9:03))) (, ,) (NP (PRP they)) (VP (MD would) (VP (VB see) (S (NP (DT another) (NN aircraft)) (VP (VB strike) (NP (DT the) (NNP World) (NNP Trade) (NNP Center)))))) (. .)))
Most people saw another plane hit the World Trade Center.
( ( Most people ) ( ( saw ( ( another plane ) ( hit ( the ( World ( Trade Center ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJS Most) (NNS people)) (VP (VBD saw) (SBAR (S (NP (DT another) (NN plane)) (VP (VBD hit) (NP (DT the) (NNP World) (NNP Trade) (NNP Center)))))) (. .)))