There was no hijack to report at 9:16.
( There ( ( was ( no ( hijack ( to ( report ( at 9:16 ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD was) (NP (DT no) (NN hijack) (S (VP (TO to) (VP (VB report) (PP (IN at) (NP (CD 9:16)))))))) (. .)))
By 9:16 there were several hijacks to report.
( ( By 9:16 ) ( there ( ( were ( several ( hijacks ( to report ) ) ) ) . ) ) )
(ROOT (S (PP (IN By) (NP (CD 9:16))) (NP (EX there)) (VP (VBD were) (NP (JJ several) (NNS hijacks) (S (VP (TO to) (VP (VB report)))))) (. .)))