At the suggestion of the Boston Center's military liaison, NEADS contacted the FAA's Washington Center to ask about American 11.
( ( At ( ( the suggestion ) ( of ( ( the ( Boston ( Center 's ) ) ) ( military liaison ) ) ) ) ) ( , ( NEADS ( ( contacted ( ( ( the ( FAA 's ) ) ( Washington Center ) ) ( to ( ask ( about ( American 11 ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (NP (DT the) (NN suggestion)) (PP (IN of) (NP (NP (DT the) (NNP Boston) (NNP Center) (POS 's)) (JJ military) (NN liaison))))) (, ,) (NP (NNS NEADS)) (VP (VBD contacted) (S (NP (NP (DT the) (NNP FAA) (POS 's)) (NNP Washington) (NNP Center)) (VP (TO to) (VP (VB ask) (PP (IN about) (NP (NNP American) (CD 11))))))) (. .)))
NEADS never contacted the FAA, the Boston Center suggested they not.
( NEADS ( never ( ( contacted ( ( ( the FAA ) , ) ( ( the ( Boston Center ) ) ( ( suggested they ) not ) ) ) ) . ) ) )
(ROOT (S (NP (NNS NEADS)) (ADVP (RB never)) (VP (VBD contacted) (NP (NP (DT the) (NNP FAA)) (, ,) (NP (NP (DT the) (NNP Boston) (NNP Center)) (VP (VBN suggested) (NP (PRP they)) (RB not))))) (. .)))