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 had been increasing speed to reach 530 miles per hour.
( ( American ( Airlines ( Flight 77 ) ) ) ( ( had ( been ( ( increasing speed ) ( to ( reach ( ( 530 miles ) ( per hour ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP American) (NNP Airlines) (NNP Flight) (CD 77)) (VP (VBD had) (VP (VBN been) (VP (VBG increasing) (NP (NN speed)) (S (VP (TO to) (VP (VB reach) (NP (NP (JJ 530) (NNS miles)) (PP (IN per) (NP (NN hour)))))))))) (. .)))