(Project Blue Book, U.S. Air Force, Washington, D.C.)
Source: Fold3.com, Lindon, Utah.
Quote from the document (Page 1):
“Observor sighted objects while cruising at 19,000 ftand observed them until they made 180°turn at which time he made a 90° turn in an effort to intercept objects.”
The UFO incident was witnessed by an airport manager, according to the document.
The case is listed as “Unidentified.”
The document contains drawings of the UFOs.
Satellite photo of Mountain Home, Idaho (tageo.com)