Rectangle over VALLEJO, CA
A conventional explanation is favored by the record but was never formally confirmed.
The report, as filed
Object was rectangle, looked similar to a shipping container, but larger, it moved perfectly across the horizon from noth to south. It was a dark color, brown or black. It was clearly not a plane or drone, there were no wings or lights. Possible advertising banner being pulled by an airplane. [NUFORC annotation: Aircraft - Probable]
Held as-reported from National UFO Reporting Center (record NUFORC #176161). Witness text is preserved verbatim, including its spelling; nothing is edited beyond formatting.
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Routed to: Federal Aviation Administration · records window 2023-05-23 → 2023-06-09