From 'The call lasted about two minutes, after which Policastro and a colleague tried unsuccessfully to contact the flight.', can we conclude that 'Policastro and a colleague were not able to call the flight. ' is unrelated and maintains neutrality?
The call lasted about two minutes, after which Policastro and a colleague tried unsuccessfully to contact the flight.###Policastro and a colleague were not able to call the flight. 