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Update (3:50 p.m. EDT): We don't get a happy ending to this one, unfortunately. The plane has sunk, according to the Associated Press. There's no sign the pilot survived.

Update (2:36 p.m. EDT): The pilot appears to be a doctor from Slidell, Louisiana, named Peter Hertzak, according to local broadcaster WDSU, which got the information from someone on the airport board in Slidell.

Update (1:26 p.m. EDT): There's hope for a happy ending yet. The Associated Press reports that "The plane landed softly in the water and was intact, floating right side up ... A Coast Guard helicopter was responding and a patrol boat was about 90 miles away."

Update (1 p.m. EDT): The plane, a Cessna 421 (an example of which is pictured above), is registered to Lee H. Aviation, Inc., of Wilmington, Delaware, according to Flightaware. It's a two-engine propeller plane, and the pilot was apparently the sole occupant.

Update (12:25 p.m. EDT): Breaking News is reporting the plane just went down 170 miles off the coast of Florida. (12:37 p.m.: CNN's Lisa Desjardins tweets that the Coast Guard confirmed to CNN the plane is down).

Original: The controls of an airplane might just top the list of worst places to lose consciousness. So we've got our fingers crossed for the apparently unconscious pilot of a private plane that's reportedly circling above the Gulf of Mexico, well off the coast of Florida, where he or she is expected to crash.

Two F-15s have apparently flown out to meet the prop plane as it flies aimlessly, ABC Pentagon producer Luis Martinez tweets, and have been monitoring it since about 8:45 a.m. After that F-18 crash in Virginia Beach earlier this month, this has been a really bad time for air safety on the East Coast. We'll keep you posted on what happens.

Update (12:18 p.m. EDT): According to CNN's Twitter, the plane might have as little as 15 minutes worth of fuel left. NYC Aviation shares the flight path, via flightaware.com:

Update (12:36 p.m. EDT): Via Flightaware, here's a close-up of the plane's route during its final minutes:

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