Several FAA air traffic control officials told us it was the air carriers' responsibility to notify their planes of security problems.
( ( Several ( FAA ( air ( traffic ( control officials ) ) ) ) ) ( ( ( told us ) ( it ( was ( ( the ( air ( carriers ' ) ) ) ( responsibility ( to ( notify ( ( their planes ) ( of ( security problems ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Several) (JJ FAA) (NN air) (NN traffic) (NN control) (NNS officials)) (VP (VBD told) (NP (PRP us)) (SBAR (S (NP (PRP it)) (VP (VBD was) (NP (NP (DT the) (NN air) (NNS carriers) (POS ')) (NN responsibility) (S (VP (TO to) (VP (VB notify) (NP (NP (PRP$ their) (NNS planes)) (PP (IN of) (NP (NN security) (NNS problems)))))))))))) (. .)))
FAA air traffic control officials are a respectable source on security issues.
( ( FAA ( air ( traffic ( control officials ) ) ) ) ( ( are ( ( a ( respectable source ) ) ( on ( security issues ) ) ) ) . ) )
(ROOT (S (NP (NNP FAA) (NN air) (NN traffic) (NN control) (NNS officials)) (VP (VBP are) (NP (NP (DT a) (JJ respectable) (NN source)) (PP (IN on) (NP (NN security) (NNS issues))))) (. .)))