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))))))))))) (. .)))
The military had no time to react, given only nine minutes at most.
( ( The military ) ( ( ( ( had ( no ( time ( to react ) ) ) ) , ) ( given ( ( only ( nine minutes ) ) ( at most ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN military)) (VP (VBD had) (NP (DT no) (NN time) (S (VP (TO to) (VP (VB react))))) (, ,) (PP (VBN given) (PP (NP (RB only) (CD nine) (NNS minutes)) (IN at) (NP (RBS most))))) (. .)))