 That was another-it was evidently another aircraft that hit the tower.
( That ( ( was ( another-it ( ( was evidently ) ( ( another aircraft ) ( that ( hit ( the tower ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT That)) (VP (VBD was) (ADJP (JJ another-it) (SBAR (S (VP (VBD was) (ADVP (RB evidently)) (NP (NP (DT another) (NN aircraft)) (SBAR (WHNP (WDT that)) (S (VP (VBD hit) (NP (DT the) (NN tower))))))))))) (. .)))
We were sure that there were no other aircraft hitting towers.  
( We ( ( ( were sure ) ( that ( there ( were ( ( no ( other aircraft ) ) ( hitting towers ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBD were) (ADJP (JJ sure)) (SBAR (IN that) (S (NP (EX there)) (VP (VBD were) (NP (NP (DT no) (JJ other) (NN aircraft)) (VP (VBG hitting) (NP (NNS towers)))))))) (. .)))