At 9:37:46, American Airlines Flight 77 crashed into the Pentagon, traveling at approximately 530 miles per hour.
( ( At 9:37:46 ) ( , ( ( American ( Airlines ( Flight 77 ) ) ) ( ( ( ( crashed ( into ( the Pentagon ) ) ) , ) ( traveling ( at ( ( ( approximately 530 ) miles ) ( per hour ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 9:37:46))) (, ,) (NP (NNP American) (NNP Airlines) (NNP Flight) (CD 77)) (VP (VBD crashed) (PP (IN into) (NP (DT the) (NNP Pentagon))) (, ,) (S (VP (VBG traveling) (PP (IN at) (NP (NP (QP (RB approximately) (CD 530)) (NNS miles)) (PP (IN per) (NP (NN hour)))))))) (. .)))
American Airlines Flight 77 struck the Pentagon at precisely 9:37:46.
( ( American ( Airlines ( Flight 77 ) ) ) ( ( ( struck ( the Pentagon ) ) ( at ( precisely 9:37:46 ) ) ) . ) )
(ROOT (S (NP (NNP American) (NNP Airlines) (NNP Flight) (CD 77)) (VP (VBD struck) (NP (DT the) (NNP Pentagon)) (PP (IN at) (NP (RB precisely) (CD 9:37:46)))) (. .)))