It is advisable to clarify that are considered as aeronautical cases those that were observed from aircrafts. This chapter describes five significant cases arisen in various continents and which were the object of an inquiry on behalf of the authorities of the concerned countries. In four cases objects were discovered at the same moment visually and by radar. In the fifth they were observed by numerous independent witnesses.

 LAKENHEATH (UNITED KINGDOM) (in August 13-14, 1956)

Military bases common to the U.S. Air Forces and to the RAF of Lackenheath and Bentwaters is situated, the first in some 30 km in the northeast of Cambridge, the second near the coast east of this city. The unknown air objects, followed by them radars in the night from 13 till 14 August 1956, were considered ' not identified ' by the report published in 1969 by the committee Condon loaded with estimating the works on the OVNI of the American Air Force. The magazine Astronautics and Aeronautics published in September, 1971 a study of the case by Thayer, the radar expert of the committee Condon, who leaned partially on a study presented in 1969 by the profeseur Mac Donald, physicist of the atmosphere. For the record, let us indicate that repeatedly, in particular in 1976, Philip Klass, writer of the review Aviation Week and Space Technology, tried to criticize these works and to reduce the case to a series of common events (meteorites, abnormalities of radar distribution, etc.). The incidents began on Bentwaters's base, preceded, between 21 o'clock and 22 o'clock, by unusual observations of the radar of control of approach, which we shall not detail. They took place as follows:

- At 22. 55, the radar discovers a not identified object moving of is in the West in passing above the base, always almost in front of wind in the visible speed of 2000 in 4000 miles by the hour (mph), is 3200 in 6400 kph. No sound clap is mentioned. The staff of Bentwaters's control tower then tells to have seen a brilliant light glancing through the ground of is in the West ' in a formidable speed ', in about 1200 m of height. At the same moment, the pilot of a military transport aircraft, glancing through Bentwaters in 1200 m of height, declares that a brilliant light is spent under its plane by turning darker of is in the West ' in a formidable speed '. Both visual observations consolidate the radar detection.

- The radar operator of Bentwaters indicates these radar and visual observations corresponding to the leader of quarter of the radar mission control of Lakenheath's traffic, an American non-commissioned officer has whom we owe a report detailed enough by these observations and by those that follow. The report, sent in 1968 to the committee Condon by the then retired serviceman, is coherent, and does not contradict, except there some minor points, the documents of the file Blue Book de l' USAF ; among them, the statutory telex, sent to the team Blue Book in the daytime of the incident by Lakenheath, and the sent report two weeks later to this same team by the American captain Holt, the intelligence officer to Bentwaters.

- The leader of quarter of Lakenheath's base notifies his radar operators. The one of them discovers a still object in about 40km in the southwest of the base, almost in the axis of the trajectory of the supersonic object seen at 22. 55. The leader of quarter calls the radar of approach of Lakenheath, which confirms the observation. The radar operators of the mission control of the air traffic see suddenly the object passing at once of the immobility in a speed from 600 to 950 kph. The leader of quarter prevents the major of the base. The object changes several times direction, describing right segments, varying from 13 to 30 km, separated by abrupt stops from 3 till 6 minutes; the speed always passes without transition of a no value in a value of some 950 kph. Visual observations are made by the ground and confirm the important speed and the stunning accelerations. The statutory telex sent by Lakenheath ends : " The fact that fast accelerations and abrupt stops of the object were discovered by the radar and by the sight from the ground gives to the report a sure credibility. One does not believe that these observations can have any meteorological or astronomical origin. "

- At the end of 30 to 45 minutes, the RAF sends a night hunter, a two-seater Venom, in pursuit of the object. The radar mission control of Lakenheath's air traffic the guide in the direction of the object, in 10 km east of the centre. The pilot acquires the target visually and in the radar, then loses it. The centre steers it then in 16 km east of Lakenheath ; the pilot acquires again a target and says " my machine guns are aimed at him ". A short time later, he loses once again his target, but this one was followed by the radar operators of the centre; they inform the pilot that the object made a fast movement to take place behind him, and follows him at short distance. The pilot confirms. Observed by the radar operators, the pilot tempts during about 10 minutes all the movements to take place again behind the object (gone up in candle, pricked, continuous bends), but he does not reach there: the OVNI follows him, at constant distance according to radars on the ground. Finally, short of running, he returns to his base, asking that one says to him if the object persists in following him. THE OVNI follows him, indeed , on a short distance, then stands still. The radar operators will see then the object making some short movements, then leaving in the direction of the North in some 950 kph and disappearing at 3. 30 outside the reach of radars.

- Venom sent as a replacement by the first one should return quickly on its base as a result of mechanical troubles, before having been able to establish a contact with the object.

Thayer concluded so his article in the review Astronautics and Aeronautics : " If one considers the high credibility of the information and the coherence and the continuance of the reports, as well as their high degree " of strangeness ", this case of OVNI is certainly one of the most disturbing known to this day. "

C Plane RB-47 in the United States ( July 17, 1957)

C Teheran ( September 18 to 19, 1976)

C Russia ( March 21, 1990)

C San Carlos of Bariloche ( July 31, 1995)