🇺🇸 USAF — Project Blue Book
A 1966 report describes an object with red, green, and white lights that blinked and brightened. A contrail was observed as the object approached from the east. An investigator sketched an east-west holding pattern similar to aircraft maneuvers near a navigational aid, matching the object's movements. The FAA found no air traffic in the area during the sighting, but only IFR flight plans are recorded, leaving the possibility of an unregistered aircraft.