The Tequesquitengo Interception

Carlos de los Santos was flying a light Piper, which the archive's telling gives as a PA-24 Comanche and other accounts as an Aztec, at ten thousand feet on the leg between the Tequesquitengo beacon and Mexico City airport, over the Sierra del Ajusco. According to the account the archive holds, three grey domed discs, each around sixteen feet across, closed on the aircraft and came within centimetres of the wings. One struck and damaged the landing gear. He then lost all control for eighteen minutes while the aeroplane was carried up to fourteen and a half thousand feet. When it was released the discs departed towards Popocatépetl, and he landed after roughly an hour of passes.

What is on the record

Three claimants are resolved: de los Santos himself and two others, Emilio Estaniel Lopez and Interian Diaz. The strongest element in the account is the report that air traffic controllers confirmed three radar echoes. Independent instrument confirmation of a pilot's visual report is the classic combination in this subject.

The archive holds no radar record. It is important to keep those two statements next to each other. The account says controllers saw three returns; our holdings contain the account, and no Mexican civil aviation document, no controller statement, and no strip. Outside the archive, sceptical reviewers have proposed hypoxia at altitude as an explanation for the lost control, which the file records as a live ordinary explanation without adopting it.

The account also records that the pilot was afterwards visited twice by identical men described as Nordic, who threatened him into silence. That rests on his own later statements and should be read as his claim rather than as corroborated fact.

Why it sits where it does

This case grades L3, the archive's tier for multiple independent claimants describing one connected event. It would sit higher if the radar strip were in our holdings, and it is not. What boxed in that aircraft is not resolved here.