At least some FAA officials in Boston Center and the New England Region knew that a hijacker on board American 11 had said we have some planes.
( ( ( ( ( At least ) some ) ( FAA officials ) ) ( in ( ( ( Boston Center ) and ) ( the ( New ( England Region ) ) ) ) ) ) ( ( knew ( that ( ( ( a hijacker ) ( on ( board ( American 11 ) ) ) ) ( had ( said ( we ( have ( some planes ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (QP (IN At) (JJS least) (DT some)) (NNP FAA) (NNS officials)) (PP (IN in) (NP (NP (NNP Boston) (NNP Center)) (CC and) (NP (DT the) (NNP New) (NNP England) (NNP Region))))) (VP (VBD knew) (SBAR (IN that) (S (NP (NP (DT a) (NN hijacker)) (PP (IN on) (NP (NN board) (NNP American) (CD 11)))) (VP (VBD had) (VP (VBD said) (SBAR (S (NP (PRP we)) (VP (VBP have) (NP (DT some) (NNS planes)))))))))) (. .)))
American 11 was checked by the FAA and was cleared for landing.
( ( American 11 ) ( ( ( ( was ( checked ( by ( the FAA ) ) ) ) and ) ( was ( cleared ( for landing ) ) ) ) . ) )
(ROOT (S (NP (NNP American) (CD 11)) (VP (VP (VBD was) (VP (VBN checked) (PP (IN by) (NP (DT the) (NNP FAA))))) (CC and) (VP (VBD was) (VP (VBN cleared) (PP (IN for) (NP (NN landing)))))) (. .)))