He tried the radios, first calling the aircraft directly, then the airline.
( He ( ( ( ( tried ( the radios ) ) , ) ( first ( calling ( ( ( ( the aircraft ) directly ) , ) ( then ( the airline ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD tried) (NP (DT the) (NNS radios)) (, ,) (S (ADVP (RB first)) (VP (VBG calling) (S (S (NP (DT the) (NN aircraft)) (ADVP (RB directly))) (, ,) (S (ADVP (RB then)) (NP (DT the) (NN airline))))))) (. .)))
He didn't try contacting the plane and never talked to the airline.
( He ( ( ( ( ( did n't ) ( try ( contacting ( the plane ) ) ) ) and ) ( never ( talked ( to ( the airline ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VP (VBD did) (RB n't) (VP (VB try) (S (VP (VBG contacting) (NP (DT the) (NN plane)))))) (CC and) (VP (ADVP (RB never)) (VBD talked) (PP (TO to) (NP (DT the) (NN airline))))) (. .)))