The call lasted about two minutes, after which Policastro and a colleague tried unsuccessfully to contact the flight.
( ( The call ) ( ( lasted ( about ( ( ( two minutes ) , ) ( ( after which ) ( ( ( Policastro and ) ( a colleague ) ) ( ( tried unsuccessfully ) ( to ( contact ( the flight ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN call)) (VP (VBD lasted) (PP (IN about) (NP (NP (CD two) (NNS minutes)) (, ,) (SBAR (WHPP (IN after) (WHNP (WDT which))) (S (NP (NP (NNP Policastro)) (CC and) (NP (DT a) (NN colleague))) (VP (VBD tried) (ADVP (RB unsuccessfully)) (S (VP (TO to) (VP (VB contact) (NP (DT the) (NN flight))))))))))) (. .)))
The call only lasted 5 seconds before it was dropped.
( ( The call ) ( only ( ( ( lasted ( 5 seconds ) ) ( before ( it ( was dropped ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NN call)) (ADVP (RB only)) (VP (VBD lasted) (NP (CD 5) (NNS seconds)) (SBAR (IN before) (S (NP (PRP it)) (VP (VBD was) (VP (VBN dropped)))))) (. .)))