Henry Clark, manager of a flying service, flying a Piper Clipper at 19,000 feet, saw seven delta-shaped objects, 35-55 feet in span, 20-30 feet long, 2-5 feet thick, light colored except for a 12 feet diameter dark circle at the rear of each, with a flat top surface and a 2-5 feet high dome, sharp needle nose, flat tail, outer panels oscillated then disappeared. Objects flew in a tight formation of 2's with one behind, and made a perfect, but unbanked, right turn about 1,500 feet ahead and 500 feet below with no wake turbulence, displaying decreasing smooth oscillations, then turned right again passing the aircraft at about 450-500 mph. Clark's engine ran rough during the sighting, and on landing was found with all spark plugs burned out.

Seven dark delta-shaped objects, , were observed by one male witness for ten minutes (Henry Clark).

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