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No sign in northern corridor

Dimensions of the Boeing 777-200ER Wing span: 60.9 metres Overall length: 63.7 metres Tail height: 18.5 metres Fuselage diameter: 6.19 metres

Where the missing plane went after it flew out of range of Malaysia's military radar off the country's northwest coast has been one of the most puzzling aspects of what has quickly become perhaps the biggest mystery in modern aviation history.

Electronic "pings" detected by a commercial satellite suggested it flew for another six hours or so, but could do no better than place its final signal on one of two vast arcs: a northern corridor from Laos to the Caspian Sea, and a southern one stretching from Indonesia down to the part of the Indian Ocean that has become the focal point of the search.

Malaysia has said the search will continue in both corridors until confirmed debris is found.

Hishammuddin said that, in response to a formal diplomatic request from Malaysia, China, India, Pakistan, Myanmar, Laos, Kyrgyzstan and Kazakhstan had all said, based on preliminary analysis, that there have been no sightings of the aircraft on their radar.

Aircraft and ships have renewed the search in the Andaman Sea between India and Thailand, going over areas in the northern corridor that have already been exhaustively swept.

The Pentagon said it was considering a request from Malaysia for sonar equipment. The P-8 and P-3 spy planes, which the United States is already deploying in the search, also carry "sonobuoys" that are dropped into the sea and use sonar signals to search the waters below.