Washington. The American plane that does not answer the radio calls and the crew could be unconscious entered Cuban airspace after being escorted by two fighters, reported the Air Defense Command North American (NORAD).
Two American F-15 fighters escorted the aircraft until the 12-mile coastal line marking the airspace and failed to accompany the small aircraft, a Socata TBM-700 turboprop normally entitled to no more than seven seats.
NORAD considered possibly the pilot and crew lost consciousness from lack of oxygen in the cabin.
The plane took off from Rochester (New York) at 08.30 hours (04.30 GMT) and headed to Naples (Florida), where he was to have landed at noon (16 GMT), according to flight tracking website FlightAware.
According to the path leading the plane, is directed towards the province of Santiago de Cuba, south of which the United States has a naval base in Guantanamo.
The Federal Aviation Administration (FAA) said in a statement that the pilot failed to answer radio calls about 13.00 local time (17.00 GMT) while flying at about 25,000 feet.
This week, NORAD had to deploy two fighters through a similar situation, in which the pilot of a small plane lost consciousness and ended up crashing the plane into the Atlantic.