Indeed, it is not clear to us that the video teleconference was fully under way before 9:37, when the Pentagon was struck.
( Indeed ( , ( it ( ( ( ( is not ) ( clear ( to us ) ) ) ( that ( ( the ( video teleconference ) ) ( ( ( ( was fully ) ( under ( way ( before 9:37 ) ) ) ) , ) ( when ( ( the Pentagon ) ( was struck ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Indeed)) (, ,) (NP (PRP it)) (VP (VBZ is) (RB not) (ADJP (JJ clear) (PP (TO to) (NP (PRP us)))) (SBAR (IN that) (S (NP (DT the) (JJ video) (NN teleconference)) (VP (VBD was) (ADVP (RB fully)) (PP (IN under) (NP (NP (NN way)) (PP (IN before) (NP (CD 9:37))))) (, ,) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NNP Pentagon)) (VP (VBD was) (VP (VBN struck))))))))) (. .)))
The discussion had ended 20 minutes before the crash.
( ( The discussion ) ( ( had ( ( ended ( 20 minutes ) ) ( before ( the crash ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN discussion)) (VP (VBD had) (VP (VBN ended) (NP (CD 20) (NNS minutes)) (PP (IN before) (NP (DT the) (NN crash))))) (. .)))