Between 8:25 and 8:32, in accordance with the FAA protocol, Boston Center managers started notifying their chain of command that American 11 had been hijacked.
( ( Between ( ( 8:25 and ) 8:32 ) ) ( , ( ( in ( accordance ( with ( the ( FAA protocol ) ) ) ) ) ( , ( ( Boston ( Center managers ) ) ( ( ( started ( notifying ( ( their chain ) ( of command ) ) ) ) ( that ( ( American 11 ) ( had ( been hijacked ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (PP (IN Between) (NP (CD 8:25) (CC and) (CD 8:32))) (, ,) (PP (IN in) (NP (NP (NN accordance)) (PP (IN with) (NP (DT the) (NNP FAA) (NN protocol))))) (, ,) (NP (NNP Boston) (NNP Center) (NNS managers)) (VP (VBD started) (S (VP (VBG notifying) (NP (NP (PRP$ their) (NN chain)) (PP (IN of) (NP (NN command)))))) (SBAR (IN that) (S (NP (NNP American) (CD 11)) (VP (VBD had) (VP (VBN been) (VP (VBN hijacked))))))) (. .)))
The flight had been hijacked one hour before Boston Center notified anyone.
( ( The flight ) ( ( had ( been ( hijacked ( ( one hour ) ( before ( ( Boston Center ) ( notified anyone ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN flight)) (VP (VBD had) (VP (VBN been) (VP (VBN hijacked) (PP (NP (CD one) (NN hour)) (IN before) (NP (NP (NNP Boston) (NNP Center)) (VP (VBN notified) (NP (NN anyone)))))))) (. .)))