Repeatedly between 10:14 and 10:19, a lieutenant colonel at the White House relayed to the NMCC that the Vice President had confirmed fighters were cleared to engage inbound aircraft if they could verify that the aircraft was hijacked.
( ( Repeatedly ( between ( ( 10:14 and ) 10:19 ) ) ) ( , ( ( ( a ( lieutenant colonel ) ) ( at ( the ( White House ) ) ) ) ( ( ( relayed ( to ( the NMCC ) ) ) ( that ( ( the ( Vice President ) ) ( had ( confirmed ( fighters ( were ( cleared ( to ( ( engage ( inbound aircraft ) ) ( if ( they ( could ( verify ( that ( ( the aircraft ) ( was hijacked ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (ADVP (RB Repeatedly)) (IN between) (NP (CD 10:14) (CC and) (CD 10:19))) (, ,) (NP (NP (DT a) (NN lieutenant) (NN colonel)) (PP (IN at) (NP (DT the) (NNP White) (NNP House)))) (VP (VBD relayed) (PP (TO to) (NP (DT the) (NN NMCC))) (SBAR (IN that) (S (NP (DT the) (NNP Vice) (NNP President)) (VP (VBD had) (VP (VBN confirmed) (SBAR (S (NP (NNS fighters)) (VP (VBD were) (VP (VBN cleared) (S (VP (TO to) (VP (VB engage) (NP (JJ inbound) (NN aircraft)) (SBAR (IN if) (S (NP (PRP they)) (VP (MD could) (VP (VB verify) (SBAR (IN that) (S (NP (DT the) (NN aircraft)) (VP (VBD was) (VP (VBN hijacked))))))))))))))))))))) (. .)))
The Vice President denied the engagement of U.S fighters.
( ( The ( Vice President ) ) ( ( denied ( ( the engagement ) ( of ( U.S fighters ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Vice) (NNP President)) (VP (VBD denied) (NP (NP (DT the) (NN engagement)) (PP (IN of) (NP (NNP U.S) (NNS fighters))))) (. .)))