Radar Report Unclassified Complete

237UAP00051

National Archives and Records Administration

Released

—

Published

—

Added to archive

Jun 14, 2026

Department

NARA

Original size

49 KB

External ID

128a27a93260a3838b51e338b473597fc01b8d8de82ee0a21238647459c5d25e

Confidence

85%

Credibility

90%

View original document ↗ hosted at the official government source

Intelligence summary

This report details an incident involving an unidentified aerial phenomenon (UAP) observed by air traffic controllers and pilots on May 20, 2021. The UAP was detected at flight level 400 and was tracked moving northwest.

Tags & topics

Extracted timeline

Jun 15, 2021

Document Date (year hint)

Document Date (year hint) for 237UAP00051

Jun 14, 2026

Ingestion Date

Ingestion Date for 237UAP00051

Jun 14, 2026

Document Record Date

Document Record Date for 237UAP00051

Jun 14, 2026

Update Date

Update Date for 237UAP00051

Entities mentioned

SCX3036 PPJ510 Unidentified Aerial Phenomenon

Full document text

811 characters, transcribed via OCR. Errors reflect the source scan. Compare with the original ↗

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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