The other aircraft referred to by New York Center was United 175.
( ( ( The ( other aircraft ) ) ( ( referred to ) ( by ( New ( York Center ) ) ) ) ) ( ( was ( United 175 ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ other) (NN aircraft)) (VP (VBN referred) (S (VP (TO to))) (PP (IN by) (NP (NNP New) (NNP York) (NNP Center))))) (VP (VBD was) (NP (NNP United) (CD 175))) (. .)))
New York Center did not refer to any Aircrafts by name.
( ( New ( York Center ) ) ( ( ( did not ) ( ( refer ( to ( any Aircrafts ) ) ) ( by name ) ) ) . ) )
(ROOT (S (NP (NNP New) (NNP York) (NNP Center)) (VP (VBD did) (RB not) (VP (VB refer) (PP (TO to) (NP (DT any) (NNPS Aircrafts))) (PP (IN by) (NP (NN name))))) (. .)))