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))))))))) (. .)))
As soon as it began to follow the hijacking protocol, the FFA headquarters contacted the NMCC.
( ( As ( soon ( as ( it ( began ( to ( follow ( the ( hijacking protocol ) ) ) ) ) ) ) ) ) ( , ( ( the ( FFA headquarters ) ) ( ( contacted ( the NMCC ) ) . ) ) ) )
(ROOT (S (ADVP (RB As) (RB soon) (SBAR (IN as) (S (NP (PRP it)) (VP (VBD began) (S (VP (TO to) (VP (VB follow) (NP (DT the) (VBG hijacking) (NN protocol))))))))) (, ,) (NP (DT the) (NNP FFA) (NN headquarters)) (VP (VBD contacted) (NP (DT the) (NN NMCC))) (. .)))