A small private plane with only an "unresponsive" pilot on board crashed into the Gulf of Mexico on Thursday after circling for more than two hours, US officials said.
The US Air Force had scrambled two F-15 fighter jets to intercept and monitor the Cessna 421 aircraft, which was headed from the southern state of Louisiana to Florida.
North American Aerospace Defense Command said the jets "intercepted and monitored an unresponsive general aviation aircraft over the Gulf of Mexico at approximately 9:30 am" (1330 GMT).
"The NORAD fighters remained on station and monitored the aircraft until it crashed in the Gulf of Mexico at approximately 12:15 pm (1615 GMT). The fighters stayed on station to assist partner agencies in further efforts before returning to base," it added in a statement.
The light, twin-engine aircraft's "windows were iced over... They were unable to see the pilot," US Coast Guard spokesman Petty Officer Bill Colclough told AFP.
Coast Guard Seaman Ivan Barnes said the plane "landed right-side up and eventually, the nose was submerged under water."
There was no indication that the pilot, the sole person aboard, had survived, though his death was not officially confirmed.
The aircraft departed from Slidell, Louisiana, and was headed to Sarasota, Florida. But it began flying in circles, fluctuating between approximately 27,000 and 33,000 feet (8,200 and 10,000 meters) about midway through the trip, according to flight tracker FlightAware.
Colclough said the plane had been flying "erratically" about 200 miles (320 kilometers) south of Panama city, Florida.
The Coast Guard, which has requested assistance, has deployed an MH-60 Jayhawk helicopter, along with the US Coast Guard Cutter Coho patrol boat and an HC-144 Ocean Sentry maritime patrol airplane.
The Coho was staying overnight.
"This is a joint response with the Coast Guard and Air Force," said Kevin Robb, the command duty officer for the Eighth District command center. "We're saturating the scene, responding with multiple air and surface assets."
The plane is registered to Lee H Aviation Inc in Wilmington, Delaware.
One aviation expert told CNN that a loss of cabin pressure could have caused the pilot to lose consciousness.
Â© 2012 AFP
Date: Apr 20, 2012