Strange circles appear over Gulf Coast: What happened?

A United States Air Force fighter pilot grabbed the attention of skygazers along the Florida Panhandle Gulf Coast on Tuesday as a pair of ring contrails filled the sky near Destin.
The contrails were so well defined that they could be spotted on GOES-East satellite imagery just before noon Tuesday, as the National Weather Service in Tallahassee, Florida, pointed out in a tweet.
The NWS in Memphis, Tennessee, noted in a tweet that the larger contrail was 10 miles in diameter while the smalle