A manager at the Herndon Command Center asked FAA headquarters if they wanted to order a nationwide ground stop.
( ( ( A manager ) ( at ( the ( Herndon ( Command Center ) ) ) ) ) ( ( ( asked ( FAA headquarters ) ) ( if ( they ( wanted ( to ( order ( a ( nationwide ( ground stop ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN manager)) (PP (IN at) (NP (DT the) (NNP Herndon) (NNP Command) (NNP Center)))) (VP (VBD asked) (NP (NNP FAA) (NNS headquarters)) (SBAR (IN if) (S (NP (PRP they)) (VP (VBD wanted) (S (VP (TO to) (VP (VB order) (NP (DT a) (JJ nationwide) (NN ground) (NN stop))))))))) (. .)))
A manager in Herndon asked the FAA if they wanted a ground stop.  
( ( ( A manager ) ( in Herndon ) ) ( ( ( asked ( the FAA ) ) ( if ( they ( wanted ( a ( ground stop ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN manager)) (PP (IN in) (NP (NNP Herndon)))) (VP (VBD asked) (NP (DT the) (NNP FAA)) (SBAR (IN if) (S (NP (PRP they)) (VP (VBD wanted) (NP (DT a) (NN ground) (NN stop)))))) (. .)))