The hijackers had planned to take flights scheduled to depart at 7:45 (American 11), 8:00 (United 175 and United 93), and 8:10 (American 77).
( ( The hijackers ) ( ( had ( planned ( to ( take ( flights ( scheduled ( to ( depart ( at ( ( ( ( ( ( 7:45 ( -LRB- ( ( American 11 ) -RRB- ) ) ) , ) ( 8:00 ( -LRB- ( ( ( ( United 175 ) and ) ( United 93 ) ) -RRB- ) ) ) ) , ) and ) ( 8:10 ( -LRB- ( ( American 77 ) -RRB- ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS hijackers)) (VP (VBD had) (VP (VBN planned) (S (VP (TO to) (VP (VB take) (NP (NP (NNS flights)) (VP (VBN scheduled) (S (VP (TO to) (VP (VB depart) (PP (IN at) (NP (NP (NP (CD 7:45)) (PRN (-LRB- -LRB-) (NP (NNP American) (CD 11)) (-RRB- -RRB-))) (, ,) (NP (NP (CD 8:00)) (PRN (-LRB- -LRB-) (NP (NP (NNP United) (CD 175)) (CC and) (NP (NNP United) (CD 93))) (-RRB- -RRB-))) (, ,) (CC and) (NP (NP (CD 8:10)) (PRN (-LRB- -LRB-) (NP (NNP American) (CD 77)) (-RRB- -RRB-))))))))))))))) (. .)))
The hijackers planned to take late flights because fewer people would be on board.
( ( The hijackers ) ( ( planned ( to ( ( take ( late flights ) ) ( because ( ( fewer people ) ( would ( be ( on board ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS hijackers)) (VP (VBD planned) (S (VP (TO to) (VP (VB take) (NP (JJ late) (NNS flights)) (SBAR (IN because) (S (NP (JJR fewer) (NNS people)) (VP (MD would) (VP (VB be) (PP (IN on) (NP (NN board))))))))))) (. .)))