Ufo flies along with an aircraft

Here is a rather authentic and impressive looking video of a saucer shaped Unidentified Flying Object flying alongside, and in front of what seems to be a commercial aircraft. Unknown place and time. The saucer seems to change speed erratically, flyiing below and in front of the aircraft, until finally diappearing. Whether the craft disappears due to the clouds, speed increase or interdimensional wormhole entry, is of course a matter of speculation.
Any comments to add information regarding this excellent piece of  UFO evidence video footage are welcome.
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