Mexico.Carlos de los Santos

On 3 May 1975, Carlos Antonio de los Santos Montiel, a 23-year-old Mexican pilot, was flying his Piper PA-24 Comanche from Zihuatanejo toward Mexico City's Benito Juárez International Airport. On approach, at about 4,500 metres, he said he noticed an object pulling alongside his left wing; shortly after, an identical one appeared over the right, and a third below. They were, by his description, grey disks about three metres across, unmarked. From that moment the pilot reported that the aircraft stopped responding to the controls: the landing gear would not lower and the plane was pushed into an ascent he was not commanding, toward altitudes dangerous for an unpressurized cabin. Frightened of losing consciousness, he radioed a 'Mayday' to the Mexico City control tower.

The airport tower logged the emergency call and the pilot's distress. According to the case account, controllers saw no traffic to justify the manoeuvre, and it was reported that Mexican military radars had contact with objects in the area — a point that, as in many pilot cases, is central yet hard to audit decades later, because primary radar records are rarely preserved or released. After a few minutes the objects separated: two moved off and the third, per De los Santos, descended and vanished. The plane regained control and the pilot landed unharmed, visibly shaken. The episode's proximity to an international airport and the existence of a recorded emergency call give the case an institutional anchor that sets it apart from the anonymous sighting.

The case was taken seriously by credentialed investigators. Astronomer J. Allen Hynek — former scientific consultant to the U.S. Air Force and, from 1973, director of the Center for UFO Studies (CUFOS) — travelled to Mexico and personally interviewed De los Santos; the case circulated in the aviation and research literature as an example of a pilot-object encounter with reported loss of control. A frequent error is worth correcting: it is sometimes claimed the incident was investigated by the USAF's Project Blue Book, which is impossible, because Blue Book closed in December 1969, almost six years earlier. The serious investigation was Hynek's and his circle's, not that of an already-defunct program.

On top of the sighting's core a much more slippery layer was later built. De los Santos recounted that, in the following days, he was approached by suited men who warned him not to speak of the incident under veiled threats to him and his family — the classic 'men in black' motif. This part has no corroboration and belongs to a folklore (that of the MiB) most analysts treat as cultural construction, not evidence. The skeptical file on the sighting itself is equally serious: the 'loss of control' is subjective testimony under stress and possible incipient hypoxia from the climb; the 'disks' may be misidentifications of other aircraft, reflections or optical phenomena; and the radar confirmation, without primary records, cannot be verified today. The case thus stands as a pilot encounter well anchored in time and place, with a credible witness consistent for decades, but without the preserved instrumental evidence that would lift it out of the testimonial category.

De los Santos is one of the few Latin American pilot cases with airport anchoring: a 'Mayday' emergency recorded by an international control tower and a witness who has held the same account for half a century. It matters to the corpus as an example of the pilot-object encounter outside the U.S., and as an illustration of two recurring problems: radar confirmation that is asserted but whose primary records are not preserved, and the contamination of a reasonable core by a layer of folklore (the 'men in black') that drags the case toward the unverifiable. Its Tier B and its distribution — with appreciable mass in both the mundane (hypoxia, misidentification) and 'open non-human' — reflect that balance: strong, well-situated testimony, without the instrumental evidence that would confirm it. Correcting the myth that Blue Book investigated it (closed in 1969) is, moreover, part of the corpus's discipline: the source matters as much as the story.