The radio transmits a plane's speed, heading, altitude and GPS coordinates to all other planes similarly equipped, allowing each to map the traffic around it.
Air traffic controllers re-established radio contact after the plane had flown about 150 miles past its destination.
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It was not until I was able to get in the car and head home hearing it on the radio that it obviously was a plane and it was not a construction mishap.
Harten said he lost radio contact with Flight 1549 and the plane disappeared from his radar screen as it dropped below New York's skyscrapers.
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With the aircraft's fuel pump, navigation equipment and radio paralysed, the pilots glided the plane to a lower altitude and landed it on an airfield near the village of Izhma in the Komi region, about 1, 500 km (930 miles) from Moscow.
The plane was in the air for another 45 minutes after radio contact was restored, meaning that if the recorder was working properly, anything the pilots would have said during the time they weren't answering radio calls would have been recorded over.
The plane was in the air for another 45 minutes after radio contact was restored, meaning that if the recorder was working properly, anything the pilots would have said during the time they were not answering radio calls would have been recorded over.
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The plane did not issue a distress call before losing radar and radio contact, the NTSB said.
The NTSB said Saturday the plane did not issue a distress call before losing radar and radio contact.
CNN's Mike Hanna in Jerusalem said the plane was tracked by Israeli warplanes and helicopters, who established radio contact and made repeated attempts to contact the pilot, but he refused to respond or identify himself.
Before Musharraf's plane touched down, soldiers had taken control of the airport and the radio and television stations, and put a number of cabinet ministers under house arrest.
" The plane was handed off to controllers in Minneapolis as a NORDO, the designation for "no radio communications.
O'Brien also owns a network of 42 radio stations in eight European countries, a golf resort community in Portugal, a plane lessor with a fleet of 93 in Dublin and a firm, just two years old, that runs Internet job-recruiting sites in six countries, including eight in China.
The Lebanese militant group Hezbollah said on its radio station that the pilot was Stefan Nikolian, and he was flying a civilian training plane.
She stayed calm, diverted the Royal Mail plane, then gave the Russian pilot the instructions he needed to find the beam again while avoiding the radio masts.
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