Definitely an AI fake.

A complete Rainbow... photo was taken at around 30k ft above the Earth. On the ground, we usually only see the arc half of the circle.
Credit Photo: Lloyd J Ferraro
There seems to be doubt about the authenticity of the pic:
https://www.reddit.com/r/Damnthatsinteresting/comments/11c6yii/complete_rainbow_taken_from_30000_ft_in_altitude/

More details/photos: http://bit.ly/3SvxXbw

Complete Rainbow taken from 30,000 ft in altitude. Photo by pilot - Lloyd J Ferraro

Posted in r/Damnthatsinteresting by u/cenabollywood • 5,328 points and 106 comments

reddit

@Rojertb

Ice rainbows can form around a light source (e.g. sun) but it would be at their centre and the refracted colour is pale.

Rainbows are always round.

Normal rainbows are always diametrically opposite the sun, from the observer's point of view.