The controller only heard something unintelligible; he did not hear the specific words we have some planes.
( ( ( ( ( The controller ) ( only ( heard ( something unintelligible ) ) ) ) ; ) ( he ( ( did not ) ( hear ( ( the ( specific words ) ) ( we ( have ( some planes ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN controller)) (ADVP (RB only)) (VP (VBD heard) (NP (NN something) (NN unintelligible)))) (: ;) (S (NP (PRP he)) (VP (VBD did) (RB not) (VP (VB hear) (NP (NP (DT the) (JJ specific) (NNS words)) (SBAR (S (NP (PRP we)) (VP (VBP have) (NP (DT some) (NNS planes))))))))) (. .)))
The controller heard specific words from the transmission.
( ( The controller ) ( ( ( heard ( specific words ) ) ( from ( the transmission ) ) ) . ) )
(ROOT (S (NP (DT The) (NN controller)) (VP (VBD heard) (NP (JJ specific) (NNS words)) (PP (IN from) (NP (DT the) (NN transmission)))) (. .)))