FAA headquarters began to follow the hijack protocol but did not contact the NMCC to request a fighter escort.
( ( FAA headquarters ) ( ( ( ( began ( to ( follow ( the ( hijack protocol ) ) ) ) ) but ) ( ( did not ) ( contact ( the ( NMCC ( to ( request ( a ( fighter escort ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP FAA) (NNS headquarters)) (VP (VP (VBD began) (S (VP (TO to) (VP (VB follow) (NP (DT the) (NN hijack) (NN protocol)))))) (CC but) (VP (VBD did) (RB not) (VP (VB contact) (NP (DT the) (NN NMCC) (S (VP (TO to) (VP (VB request) (NP (DT a) (NN fighter) (NN escort))))))))) (. .)))
No fighter escort was requested from the NMCC.
( ( No ( fighter escort ) ) ( ( was ( requested ( from ( the NMCC ) ) ) ) . ) )
(ROOT (S (NP (DT No) (NN fighter) (NN escort)) (VP (VBD was) (VP (VBN requested) (PP (IN from) (NP (DT the) (NN NMCC))))) (. .)))