At 8:23, the dispatcher tried unsuccessfully to contact the aircraft.
( ( At 8:23 ) ( , ( ( the dispatcher ) ( ( ( tried unsuccessfully ) ( to ( contact ( the aircraft ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 8:23))) (, ,) (NP (DT the) (NN dispatcher)) (VP (VBD tried) (ADVP (RB unsuccessfully)) (S (VP (TO to) (VP (VB contact) (NP (DT the) (NN aircraft)))))) (. .)))
At around 8:23 in the morning, the dispatcher couldn't contact the aircraft.
( ( At ( ( around 8:23 ) ( in ( the morning ) ) ) ) ( , ( ( the dispatcher ) ( ( ( could n't ) ( contact ( the aircraft ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (NP (QP (RB around) (CD 8:23))) (PP (IN in) (NP (DT the) (NN morning))))) (, ,) (NP (DT the) (NN dispatcher)) (VP (MD could) (RB n't) (VP (VB contact) (NP (DT the) (NN aircraft)))) (. .)))