At 9:42, the Command Center learned from news reports that a plane had struck the Pentagon.
( ( At 9:42 ) ( , ( ( the ( Command Center ) ) ( ( ( learned ( from ( news reports ) ) ) ( that ( ( a plane ) ( had ( struck ( the Pentagon ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 9:42))) (, ,) (NP (DT the) (NNP Command) (NNP Center)) (VP (VBD learned) (PP (IN from) (NP (NN news) (NNS reports))) (SBAR (IN that) (S (NP (DT a) (NN plane)) (VP (VBD had) (VP (VBN struck) (NP (DT the) (NNP Pentagon))))))) (. .)))
News reports came in about a plane hitting the Pentagon.
( ( News reports ) ( ( came ( in ( ( about ( a plane ) ) ( hitting ( the Pentagon ) ) ) ) ) . ) )
(ROOT (S (NP (NNP News) (NNS reports)) (VP (VBD came) (PP (IN in) (NP (NP (RB about) (DT a) (NN plane)) (VP (VBG hitting) (NP (DT the) (NNP Pentagon)))))) (. .)))