Case Resolution of 'Western United States UAP'

Brief

Military personnel in 2021 reported five equidistant lights captured on infrared as a potential incursion into restricted military airspace over the Western United States. AARO, with independent concurrence from its Intelligence and Science and Technology partners, resolved the case as commercial aircraft transiting well-established air corridors at altitudes between 20,000 and 40,000 feet, as far as 300 nautical miles from the sensor. Apparent shape changes in the imagery were attributed to sensor vibration and autofocus artifacts rather than any anomalous object behavior. Boresight analysis and air-traffic control data cross-corroborated the commercial aircraft determination.

Metadata

Agency

All-domain Anomaly Resolution Office (AARO), U.S. Department of Defense

Release

2024-02-26

Type

PDF • .pdf

Length

2 pages

Classification

UNCLASSIFIED

Programs

AARO

Tags

equidistant lights, oblong dots, infrared sensor, Western United States, restricted airspace, 2021 incident, AARO case resolution, commercial aircraft misidentification

Key points

• Military personnel reported five equidistant lights as a potential incursion into restricted military airspace; the case was triggered by that airspace-violation concern.p.1
• AARO resolved the case with an 'almost certainly' confidence assessment: commercial aircraft on well-established air corridors up to 300 nautical miles from the sensor platform.p.1
• AARO's Intelligence partners and its Science and Technology partners independently reached the same conclusion, satisfying AARO's internal analytic framework for resolution.p.1
• Observers initially underestimated the objects' distance; analysis corrected the range to as far as 300 NM, explaining why apparent shapes and behavior seemed anomalous.p.1
• Apparent shape changes in the UAP were caused by sensor vibration and autofocus — not by the objects themselves.p.1
• Air-traffic control data identified the objects as travelling on known flight corridors between major regional airports.p.1
• S&T partners applied boresight analysis and confirmed the objects were at 20,000 to 40,000 feet altitude at a distance consistent with the intelligence assessment.p.2

Verbatim

• AARO assesses that the UAP in this case were almost certainly commercial aircraft travelling on well-established air corridors as far as 300 nautical miles from the platform, based on a thorough review of the data by multiple analytical and scientific entities.

  p.1

• Military personnel reported seeing five equidistant lights that they believed represented a potential incursion into restricted military airspace.

  p.1

• Apparent changes in the UAP shapes were the result of sensor vibration and autofocus.

  p.1

• Analysis of air-traffic control data suggested the objects were likely commercial aircraft transiting known flight corridors between major airports in the region.

  p.1

• AARO's S&T partners independently came to the same conclusion.

  p.2

• AARO's S&T partners used boresight analysis to determine that the UAP were commercial aircraft at an altitude of between 20,000 to 40,000 feet at a similar distance.

  p.2

Most interesting

• The objects were as far as 300 nautical miles from the sensor — roughly the distance between Los Angeles and San Francisco — yet still triggered a restricted-airspace incursion report, illustrating how IR sensors can compress perceived range at altitude.
• Two entirely separate analytical tracks — Intelligence Assessment and Science and Technology Assessment — were run independently and converged on the same resolution, which AARO cites as a structural feature of its analytic framework.
• The shape distortion captured on infrared, the detail most likely to suggest an exotic object to a lay observer, had a mundane mechanical cause: the sensor's own vibration and autofocus cycling.
• The incident date is 2021, but the case resolution was not signed until 8 May 2023 — a roughly two-year analytical lag that reflects AARO's post-establishment review of the backlog rather than a real-time resolution.
• Boresight analysis — a geometric technique for aligning an instrument's line of sight with a reference — was the S&T method used to independently pin down the aircraft altitude, without relying on the observers' original range estimates.