Thirty-seven passengers, including the hijackers, boarded the plane.
( ( ( ( ( Thirty-seven passengers ) , ) ( including ( the hijackers ) ) ) , ) ( ( boarded ( the plane ) ) . ) )
(ROOT (S (NP (NP (JJ Thirty-seven) (NNS passengers)) (, ,) (PP (VBG including) (NP (DT the) (NNS hijackers))) (, ,)) (VP (VBD boarded) (NP (DT the) (NN plane))) (. .)))
Thirty-seven passengers including the hijackers boarded the plan that hit the World Trade Center.
( ( ( Thirty-seven passengers ) ( including ( the hijackers ) ) ) ( ( boarded ( ( the plan ) ( that ( hit ( the ( World ( Trade Center ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Thirty-seven) (NNS passengers)) (PP (VBG including) (NP (DT the) (NNS hijackers)))) (VP (VBD boarded) (NP (NP (DT the) (NN plan)) (SBAR (WHNP (WDT that)) (S (VP (VBD hit) (NP (DT the) (NNP World) (NNP Trade) (NNP Center))))))) (. .)))