Mt Home, IdahoJuly 1949

# Mt Home, Idaho: Seven Delta-Shaped Objects Over the Desert (July 1949)

On July 24, 1949, a private pilot named Clark was flying his Piper Clipper airplane near Mt Home, Idaho, when he spotted seven unusual aircraft flying in tight formation. The objects moved too fast and maneuvered too precisely to be any conventional aircraft he had ever seen.

Clark described the craft as delta-shaped flying wings, each between 35 and 55 feet wide and 20 to 30 feet long. They had flat tops, slightly domed bottoms, and a distinctive dark circle roughly 12 feet across on each wing. The objects flew in two rows of three with one trailing slightly behind, maintaining formation with perfect stability. Clark noted that the outer panels of each craft appeared to oscillate, or wave smoothly, as they approached. When the objects turned, they did so without banking or skidding, using his aircraft as a turning point and maintaining a standard turn about 1,500 feet away. The entire encounter lasted one to two minutes. Clark estimated their speed between 450 and 550 miles per hour, though earlier he had suggested 550 to 650.

Clark noticed no engine exhaust, no propeller arcs, and no visible air intakes or jet openings. He passed through the area where the objects had flown but felt no turbulence, which surprised him. However, shortly after the encounter, his engine began running rough. When he landed and had mechanics inspect it, they found that all eight of his spark plugs had been shorted and burned out. The plugs were sent to Wright-Patterson Air Force Base for analysis. Clark had logged over 13,900 hours as a commercial pilot and held multiple flight licenses, leading investigators to conclude his vision and judgment were excellent.

After losing sight of the objects at roughly ten miles distance, Clark called Boise Radio as an emergency and asked them to check for nearby aircraft. Boise Radio coordinated checks with McChord Field in Washington, Hill Air Force Base in Utah, and other facilities. No military aircraft were found in the area at the time of the sighting. Weather at Mt Home that day showed scattered clouds at 5,000 feet with thirty-mile visibility, providing clear conditions for observation.

The Air Force investigation classified the case as unidentified. A test of the recovered spark plugs found no evidence of breakdown and showed them to be entirely serviceable, meaning the damage Clark reported could not be confirmed through laboratory analysis. A second witness, a weather observer in Lewiston, Idaho, reported hearing the sound of multiple aircraft at high altitude circling in the area around the same time, though he saw no lights. The investigation continued across multiple Air Force districts and remained pending as of August 1949.

This case file spans 30 pages of Air Force records as held by the National Archives.