This was United 175's last communication with the ground.
( This ( ( was ( ( ( United ( 175 's ) ) ( last communication ) ) ( with ( the ground ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBD was) (NP (NP (NP (NNP United) (CD 175) (POS 's)) (JJ last) (NN communication)) (PP (IN with) (NP (DT the) (NN ground))))) (. .)))
United 175 was able to maintain contact after this.
( ( United 175 ) ( ( was ( able ( to ( ( maintain contact ) ( after this ) ) ) ) ) . ) )
(ROOT (S (NP (NNP United) (CD 175)) (VP (VBD was) (ADJP (JJ able) (S (VP (TO to) (VP (VB maintain) (NP (NN contact)) (PP (IN after) (NP (DT this)))))))) (. .)))