Cockpit audio allegedly from an American Airlines flight captures the moment the plane's pilot alerted air traffic control to a 'long cylindrical object' in the sky.
During the flight, which took just over four hours, the unnamed pilot could be heard mentioning an object 'moving really fast' above the plane.
In audio overheard by radio interceptor Steve Douglass, who shared the clip on his Deep Black Horizon blog, the pilot asks Albuquerque Air Traffic Control: "Do you have any targets up here? We just had something go right over the top of us.
"I hate to say this but it looked like a long cylindrical object that almost looked like a cruise missile type of thing - moving really fast right over the top of us."
Speaking to ABC 7, Douglass recalled: "I heard this aircraft, basically, above all other aircraft because the tone in his voice was so excited."
He continued: "Talking to an ex military pilot I know, he says that for them to see this this object had to be coming at them practically head on.
"So whatever it was, came fast and right at them and right over them which gave them a big enough scare they had to report it."
The audio from the cockpit suggests that the object resembled some sort of military firepower, but Douglass is less convinced - saying that, at the time, the skies had been clear of military.
"It was a Sunday basically it's a military's day off," he said.
Explaining how there had also been no military test notification, Douglass added: "When tests occur the military notifies the FAA aircraft are kept out of the area and their schedules and strict flight lanes at aircraft need to stay in to not interfere with these tests.
"That's not what happened yesterday."
Now it is believed that the Federal Aviation Authority will have to investigate what happened, with Douglass saying officials tend to 'meet you at the plane' to discuss what happened, before filling out paperwork to 'figure out what it was'.
He added that there's a list of possibilities for the FAA to rule out, including branches of military or foreign countries.
Until then, however, it remains quite the mystery...
LADbible has reached out to the FAA and American Airlines for comment.
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