With 'At 8:51, the flight deviated from its assigned altitude, and a minute later New York air traffic controllers began repeatedly and unsuccessfully trying to contact it.', is it rational to deduce 'At 8:51 the flight descended from its altitude.'
At 8:51, the flight deviated from its assigned altitude, and a minute later New York air traffic controllers began repeatedly and unsuccessfully trying to contact it.###At 8:51 the flight descended from its altitude.