Project Blue Book Case #2099. On September 16, 1952, observers in Portland, Maine, reported two bright objects moving in tandem across the night sky. The objects maintained a fixed formation — suggesting coordinated flight — while traveling at a speed that exceeded any conventional aircraft of the era. Their luminosity was steady and significantly brighter than any star or planet visible that evening.
Portland's position on the northeastern seaboard made it a corridor for both military and commercial air traffic. The witnesses, familiar with the regular flow of aircraft along the coast, were emphatic that these objects bore no resemblance to airplanes. No navigation lights, no sound, no contrails — just two brilliant points of light moving in lockstep.
September 1952 came at the tail end of the great 1952 wave, which had peaked in July with the famous Washington, D.C. sightings. By mid-September, the wave was subsiding but still producing credible reports from across the country. Blue Book was receiving hundreds of cases per month, straining its small investigative staff.
The formation aspect of this sighting was particularly significant to investigators, as paired or grouped objects suggested either a single large craft with multiple light sources or multiple objects flying in coordination — neither of which had a ready conventional explanation. Weather data, aircraft schedules, and satellite reentry timetables were checked with negative results. Case #2099 was classified "Unknown."