Four objects in formation reported over Argentina

A Pan Am pilot and copilot reportedly observed four circular metallic-looking objects arranged in a diamond formation over Argentina in spring 1955. The catalogue provides neither a specific locality nor an exact day. The seasonal wording is retained as a source date claim without assigning an artificial month or date. Source: Dominique F. Weinstein, Unidentified Aerial Phenomena: Eighty Years of Pilot Sightings (NARCAP TR-04, February 2001), PDF page 30, table row 11.