No one at the FAA or the airlines that day had ever dealt with multiple hijackings.
( ( ( ( ( No one ) ( at ( the FAA ) ) ) or ) ( ( the airlines ) ( that day ) ) ) ( ( ( had ever ) ( dealt ( with ( multiple hijackings ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT No) (NN one)) (PP (IN at) (NP (DT the) (NNP FAA)))) (CC or) (NP (NP (DT the) (NNS airlines)) (NP (DT that) (NN day)))) (VP (VBD had) (ADVP (RB ever)) (VP (VBN dealt) (PP (IN with) (NP (JJ multiple) (NNS hijackings))))) (. .)))
There were those who had experience with single hijackings.
( There ( ( were ( those ( who ( had ( experience ( with ( single hijackings ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD were) (NP (NP (DT those)) (SBAR (WHNP (WP who)) (S (VP (VBD had) (NP (NP (NN experience)) (PP (IN with) (NP (JJ single) (NNS hijackings))))))))) (. .)))