That nine minutes' notice before impact was the most the military would receive of any of the four hijackings.
( ( ( ( That ( nine ( minutes ' ) ) ) notice ) ( before impact ) ) ( ( was ( ( the most ) ( ( the military ) ( would ( receive ( of ( any ( of ( the ( four hijackings ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT That) (CD nine) (NNS minutes) (POS ')) (NN notice)) (PP (IN before) (NP (NN impact)))) (VP (VBD was) (NP (NP (DT the) (JJS most)) (SBAR (S (NP (DT the) (NN military)) (VP (MD would) (VP (VB receive) (PP (IN of) (NP (NP (DT any)) (PP (IN of) (NP (DT the) (CD four) (NNS hijackings))))))))))) (. .)))
In all of the hijackings, the earliest notification the military would receive was nine minutes ahead of the crash.
( ( In ( all ( of ( the hijackings ) ) ) ) ( , ( ( ( the ( earliest notification ) ) ( ( the military ) ( would receive ) ) ) ( ( ( was ( ( nine minutes ) ahead ) ) ( of ( the crash ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT all)) (PP (IN of) (NP (DT the) (NNS hijackings))))) (, ,) (NP (NP (DT the) (JJS earliest) (NN notification)) (SBAR (S (NP (DT the) (NN military)) (VP (MD would) (VP (VB receive)))))) (VP (VBD was) (ADVP (NP (CD nine) (NNS minutes)) (RB ahead)) (PP (IN of) (NP (DT the) (NN crash)))) (. .)))