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)))))))))))) (. .)))
Air traffic control officials told us the air carriers were in charge of notifying their planes of security problems.
( ( Air ( traffic ( control officials ) ) ) ( ( ( told us ) ( ( the ( air carriers ) ) ( were ( in ( charge ( of ( notifying ( ( their planes ) ( of ( security problems ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Air) (NN traffic) (NN control) (NNS officials)) (VP (VBD told) (NP (PRP us)) (SBAR (S (NP (DT the) (NN air) (NNS carriers)) (VP (VBD were) (PP (IN in) (NP (NP (NN charge)) (PP (IN of) (S (VP (VBG notifying) (NP (NP (PRP$ their) (NNS planes)) (PP (IN of) (NP (NN security) (NNS problems))))))))))))) (. .)))