The puzzled voice of a US Air Force pilot reporting his terrifyingly close call with a UFO has been heard for the first time.

Traveling at supersonic speed, the unknown craft came within a 10 feet of the pilot's wing, who was conducting a secret mission over California.

The pilot, who identified as 'Troy 21,' told local air traffic control (ATC) in Los Angeles: 'This is going to sound weird, but I just had something pass underneath my wing, maybe a football-sized object right underneath my wing.'

During the September 17, 2024 incident, ATC is heard asking Troy 21 if he thought the object might have been a drone, but the stunned pilot couldn't tell.

Troy 21 replied that his sensor operator was looking for the UFO on the plane's cameras, adding that it was a 'dark gray cylindrical object' no bigger than a football.

The pilot quickly informed ATC that they had spotted the UFO again about 60 miles from where it first buzzed Troy 21's plane.

Later in the recording, another air traffic controller in Los Angeles can be heard on the radio dismissing the incident, saying that 'there was UFO reported here, but that's all taken care of now. So you don't have to worry about it... it's gone.'

Former FBI agent Ben Hansen told NewsNation the mysterious object must have be traveling at Mach 2, or twice the speed of sound, to get so far away so fast.

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