Boston Center asked the Herndon Command Center to issue a similar cockpit security alert nationwide.
( ( Boston Center ) ( ( asked ( ( the ( Herndon ( Command Center ) ) ) ( to ( ( issue ( a ( similar ( cockpit ( security alert ) ) ) ) ) nationwide ) ) ) ) . ) )
(ROOT (S (NP (NNP Boston) (NNP Center)) (VP (VBD asked) (S (NP (DT the) (NNP Herndon) (NNP Command) (NNP Center)) (VP (TO to) (VP (VB issue) (NP (DT a) (JJ similar) (NN cockpit) (NN security) (NN alert)) (ADVP (RB nationwide)))))) (. .)))
The cockpit security alert that Boston Center requested was ten sentences long.
( ( ( The ( cockpit ( security alert ) ) ) ( that ( ( Boston Center ) requested ) ) ) ( ( was ( ( ten sentences ) long ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN cockpit) (NN security) (NN alert)) (SBAR (IN that) (S (NP (NNP Boston) (NNP Center)) (VP (VBD requested))))) (VP (VBD was) (ADVP (NP (CD ten) (NNS sentences)) (RB long))) (. .)))