UFO?
Nope, they called hold punch clouds.
A “Hole Punch” cloud is a non-technical name given to a cloud formed from an aircraft dissipation hole or trail. They are also called "Punch Hole" clouds. Rather than extending as a line, Hole Punch clouds appear as a circular or oval hole in a deck or thin layer of supercooled water clouds. They are not uncommon where jet flight paths intersect altocumulus or cirrocumulus layers. What is uncommon is when they form in a perfect circle that persists for a length of time to be widely observed.
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