Baffling footage of snake-like UFO hovering beside a passenger plane on a flight from Los Angeles to New York City has been released on YouTube.

A recording was posted to the website on May 2, despite people saying the content was originally recorded on December 19, 2019.

The newly-released footage shows a long object swerving from side to side as it moves upwards through the sky.

Confused passengers on the plane can be heard saying: "What the f***k" is that?"

The witness who uploaded the footage said: It was moving around like a snake, swerving sideways and moving upwards."

To read more and view the video, click here.