The aircraft's identity or type was unknown.
( ( ( The ( aircraft 's ) ) ( ( identity or ) type ) ) ( ( was unknown ) . ) )
(ROOT (S (NP (NP (DT The) (NN aircraft) (POS 's)) (NN identity) (CC or) (NN type)) (VP (VBD was) (ADJP (JJ unknown))) (. .)))
The aircraft was clearly identified.  
( ( The aircraft ) ( ( was ( clearly identified ) ) . ) )
(ROOT (S (NP (DT The) (NN aircraft)) (VP (VBD was) (VP (ADVP (RB clearly)) (VBN identified))) (. .)))