more here: https://eraoflight.com/2023/01/13/this-is-clearest-ufo-photo-ever-released-that-shows-typical-alien-craft/

On September 4, 1971, members of the Instituto Geográfico Nacional (National Geographic Institute) took photographs above Lake Cote for the Costa Rican governmental company that provides electricity and telecommunication services. The photographs were taken for the construction of a hydroelectric dam near lake Arenal, when the mapping agency members accidentally captured a UFO in their high-resolution camera that was mounted on the plane, pointing downwards. The photograph is considered to be the clearest and best UFO photograph ever taken.

Sergio Loaiza, Juan Bravo and Francisco Reyes were flying in a Canadian-made Areo-Commander model F680 piloted by Omar Arias, and Loaiza was in charge of aerial photography that day. They were flying above Costa Rica with a 100-pound map-making camera when Loaiza captured a photograph of a metallic disc like a typical alien “flying saucer” that can be seen flying between the F680 aircraft and the ground.