In sum, the protocols in place on 9/11 for the FAA and NORAD to respond to a hijacking presumed that
( ( In sum ) ( , ( ( the protocols ) ( in ( ( place ( on ( 9/11 ( for ( the ( ( FAA and ) NORAD ) ) ) ) ) ) ( to ( respond ( to ( ( a hijacking ) ( presumed that ) ) ) ) ) ) ) ) ) )
(ROOT (FRAG (PP (IN In) (NP (NN sum))) (, ,) (NP (NP (DT the) (NNS protocols)) (PP (IN in) (NP (NP (NN place)) (PP (IN on) (NP (NP (CD 9/11)) (PP (IN for) (NP (DT the) (NNP FAA) (CC and) (NNP NORAD))))) (S (VP (TO to) (VP (VB respond) (PP (TO to) (NP (NP (DT a) (NN hijacking)) (VP (VBN presumed) (NP (DT that)))))))))))))
No proticsls were used on 9/11 to prevent tragedy. 
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(ROOT (S (NP (DT No) (NNS proticsls)) (VP (VBD were) (VP (VBN used) (PP (IN on) (NP (CD 9/11))) (S (VP (TO to) (VP (VB prevent) (NP (NN tragedy))))))) (. .)))