The flight had taken off just as American 11 was being hijacked, and at 8:42 the United 175 flight crew completed their report on a suspicious transmission overheard from another plane (which turned out to have been Flight 11) just after takeoff.
( ( ( ( ( ( The flight ) ( had ( ( ( taken off ) just ) ( as ( ( American 11 ) ( was ( being hijacked ) ) ) ) ) ) ) , ) and ) ( ( at 8:42 ) ( ( the ( United ( 175 ( flight crew ) ) ) ) ( ( ( ( completed ( their report ) ) ( on ( ( a ( suspicious transmission ) ) ( overheard ( from ( another plane ) ) ) ) ) ) ( -LRB- ( ( which ( ( turned out ) ( to ( have ( been ( Flight 11 ) ) ) ) ) ) -RRB- ) ) ) ( just ( after takeoff ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN flight)) (VP (VBD had) (VP (VBN taken) (PRT (RP off)) (ADVP (RB just)) (SBAR (IN as) (S (NP (NNP American) (CD 11)) (VP (VBD was) (VP (VBG being) (VP (VBN hijacked))))))))) (, ,) (CC and) (S (PP (IN at) (NP (CD 8:42))) (NP (DT the) (NNP United) (NNP 175) (NN flight) (NN crew)) (VP (VBD completed) (NP (PRP$ their) (NN report)) (PP (IN on) (NP (NP (DT a) (JJ suspicious) (NN transmission)) (VP (VBN overheard) (PP (IN from) (NP (DT another) (NN plane)))))) (PRN (-LRB- -LRB-) (SBAR (WHNP (WDT which)) (S (VP (VBD turned) (PRT (RP out)) (S (VP (TO to) (VP (VB have) (VP (VBN been) (NP (NNP Flight) (CD 11))))))))) (-RRB- -RRB-)) (PP (ADVP (RB just)) (IN after) (NP (NN takeoff))))) (. .)))
The United flight crew knew nothing about American 11.
( ( The ( United ( flight crew ) ) ) ( ( ( knew nothing ) ( about ( American 11 ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP United) (NN flight) (NN crew)) (VP (VBD knew) (NP (NN nothing)) (PP (IN about) (NP (NNP American) (CD 11)))) (. .)))