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))) (. .)))
There were a hundred passengers who boarded the plane in addition to the hijackers.
( There ( ( were ( ( a ( hundred passengers ) ) ( who ( ( ( boarded ( the plane ) ) ( in addition ) ) ( to ( the hijackers ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD were) (NP (NP (DT a) (CD hundred) (NNS passengers)) (SBAR (WHNP (WP who)) (S (VP (VBD boarded) (NP (DT the) (NN plane)) (PP (IN in) (NP (NN addition))) (PP (TO to) (NP (DT the) (NNS hijackers)))))))) (. .)))