Documents / Official release
This Federal Aviation Administration Skywatch incident report, released in 2023, records an unidentified aerial phenomenon on May 20, 2021, reported through Washington Center (ZDC). A controller saw a Mode C intruder alert moving slowly northwest about 50 miles southeast of RIC at FL400. One of two queried aircraft at FL390 reported a phenomenon just above it, and the other saw contrails. CONR observed a primary target, while an AMOC replay found nothing. The report is marked closed.
SKYWATCH INCIDENT REPORT PRIMARY CODE: UNIDENTIFIED AERIAL PHENOMENON Date: 19:49 05/20/2021 Status: Closed POD: DEN Reporting Facility: ZDC Paged: NO REMARKS Mode C intruder alert observed by controller moving slowly to the NW 50 SE of RIC @ FL400. 2 aircraft at FL390 were queried. First aircraft reported an unidentified aerial phenomenon just above them at FL400 and second aircraft (some time later) saw contrails above them at FL400. HQ DEN requested CONR to look at replay. CONR observed primary target off the HPW031 at 12 NM. The unknown phenomenon was traveling NW bound at approximately FL400. HQ DEN asked AMOC for replay and negative results found. ZDC reported calls signs of two previous aircraft as SCX3036 and PPJ510. SKYWATCH INCIDENT REPORT | DATE: 2021-05-20T19:49 | POD: DEN | PAGE 1 of 1
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Official release, from the nara collection. The PDF is mirrored here; the original link is above. 1 pages are in the text index: search them above, or from the library's search.