Weather balloons are not the only air-borne objects that have been mistaken for interplanetary craft. Flying saucers reported over Durango, Colorado, early in August 1952 turned out to be four T-33 Air Force jets flying at 30,000 feet, so high that no sound reached the ground.
A low-flying jet, enveloped in an aura of cloud made by the jet itself, can look like a strange object. This condensation phenomenon, called a contrail, occurs when areas of low pressure develop on the wing surface; the air cools by expansion in the slowly moving boundary layer in contact with the wing. Both the depth of the boundary layer and the drop in pressure increase with increasing air speed, but each depends very closely on the aerodynamic qualities of the wing. An excellent photograph of one such disk produced by a Canberra jet was taken on February 4, 1956, along the coast of Africa near Accra on a morning when the condensation phenomenon occurred several times during air maneuvers. The weather was fine, the sky cloudless with a few patches of haze over the sea, and visibility was more than eight miles. During the display the air speed of the jets was usually too low or the air too dry for the aura to form. “But over the cliff edge where the sea-breeze was just beginning to break through in patches the air would be moist enough to condense about 1½ gm. of water droplets in each cubic metre of air, quite sufficient to produce the observed effect. The effect is increased by higher speeds at the end of a dive (when the angle of incidence of the aerofoil is least) ... but it is likely that the patchy onset of the sea-breeze was the most important contributing factor.”[[III-7]]
A flying saucer reported from Johannesburg, South Africa, on April 11, 1958, belongs in this category. Hundreds of witnesses reported a mysterious starlike object maneuvering in the northern sky on three successive nights at speeds in excess of 2000 miles an hour. Most observers agreed that “The Thing” could not have been any known aircraft because its speed was too great; it sometimes hovered stationary in the air, and repeatedly changed color from white to red to deep scarlet. One member of an Interplanetary Club who watched it through binoculars described the UFO as saucer-shaped, with a rim like a soup plate around the edge.
Members of the Council for Scientific and Industrial Research Minitrack Station, near Johannesburg, were amused by the variety of reports on “The Thing.” The mysterious object in the night skies was in fact a South African Air Force Dakota aircraft, flying back and forth so that the Minitrack Station could test the calibration of its tracking instruments. In addition to the usual navigation lights, the aircraft had carried a bright, flashing light so that it could be photographed[[III-7a]].
A flight of bombers refueling in mid-air at night can be a startling spectacle and more than once has been reported as a gathering of flying saucers.
Such an incident occurred in Florida on October 31, 1955, when a disk jockey at Gainesville broke into his radio program about ten o’clock in the evening to announce that flying saucers were over the station. Many of his listeners hurried out of their houses to look at the Halloween visitors, clearly visible in the night sky. One reporter stated that he had seen four to six objects, oblong in shape, brilliantly glowing, red and orange, traveling soundlessly in a straight-line formation that later changed to a V[[III-8]]. Both the radio station and the police station were swamped with telephone calls from frightened citizens, most of whom calmed down when they learned the explanation: a flight of bombers had been refueling at an altitude of 32,000 feet.
The Killian Case
The most famous UFO sighting of this type is the Killian case. On the evening of February 24, 1959, an American Airlines plane was flying from Newark to Detroit. At about 8:45 P.M., when the plane was near Bradford, Pennsylvania, the pilot, Captain Killian, noticed some puzzling lights above and to the left of his plane. There seemed to be three, their colors changing from yellow to light orange, dimming and brightening in intensity and shifting their relative positions. At first he supposed he was looking at the constellation Orion, for the lights had the same configuration as the stars in Orion’s “belt,” but when the lights changed position and he could see Orion itself in addition to the lights, he discarded his first theory. He considered the possibility of a jet tanker refueling operation, but decided the lights were moving too slowly. He couldn’t think of any ordinary explanation—but he had long wondered what truth there was in the idea of flying saucers and had thought there must be something to it.
Over the loud speaker he remarked to the passengers that American Airlines had a special treat for them which they could see by looking out of the left windows. He continued to watch the lights as he flew west toward Detroit, and radioed two other American Airlines planes in the area. Learning that their pilots were also watching the unusual spectacle, he notified Air Traffic Control (ATC) in Detroit. The lights remained in view for about forty minutes, all the way to Detroit, and the pilot lost sight of them only when he began to let down through the haze for a landing.
Reporters and photographers were waiting to interview him, and next day’s Detroit Times carried a banner headline, “Mystery Discs Trail Plane Here,” over a picture of Captain Killian flanked by the plane’s two pretty hostesses, all three smiling as they held up to the camera three ordinary kitchen saucers[[III-9]]. After checking with the Detroit ATC, who did not know of any scheduled refueling operation, the pilot reported his experience to officials of American Airlines, and next day returned to New York where again he was besieged by reporters and photographers. Meanwhile, following standard CIRVIS procedure (Communication Instruction for Reporting Vital Intelligence Sighting from Aircraft), the manager of operations of American Airlines reported the incident to ATIC at Wright-Patterson Air Force Base.