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UAP flight characteristics: the physics of the observed kinematics, sourced

The physical record of UAP flight characteristics: instantaneous acceleration, hypersonic velocity without sonic boom, trans-medium transition between atmosphere and water, the absence of typical aerodynamic wake. Drawn from named-witness testimony, sensor data, and the peer-reviewed physics literature.

The 2021 ODNI Preliminary Assessment described the observed UAP flight characteristics in five categories: 'remaining stationary in winds aloft, moving against the wind, manoeuvring abruptly, moving at considerable speed, and not showing identifiable means of propulsion.' Subsequent AARO Historical Record reporting and congressional testimony have repeated and extended that taxonomy.

The peer-reviewed treatment begins with Knuth et al. (2019, 'Estimating Flight Characteristics of Anomalous Unidentified Aerial Vehicles', published in Entropy), which derives quantitative bounds on the implied accelerations and propulsion power for a small set of well-documented cases. The 2024 AIAA review (Powell et al., 'Reported Shape, Size, Kinematics ... of UAP from Select Reports, 1947–2016') extends the dataset to thousands of cases and provides the statistical baseline.

The Loeb & Kirkpatrick paper. The 2023 Harvard CfA preprint co-authored by Galileo Project founder Avi Loeb and then-AARO director Sean Kirkpatrick ('Physical Constraints on Unidentified Aerial Phenomena') is the single most-cited treatment of the question: what envelope can UAP behaviour occupy before requiring physics outside the current standard model? The paper is on the Research library page.

Why this matters. The flight-characteristics record is the part of UAP that is least dependent on cultural interpretation. Either the sensor and witness reports are consistent with conventional aerospace technology, or they aren't. The peer-reviewed literature now treats that question as empirically tractable, not metaphysical.

All entries

21 entries · sorted newest first

Document Release
Featured

PURSUE Release 03: Department of War declassifies 72 more UAP files — the FBI's tranche

The third tranche of the Trump administration's PURSUE program: 72 files — 53 documents, 10 images, 6 videos, 3 audio files — bringing the public corpus to 294 files. The FBI dominates with 29 files, anchored by two modern American case clusters: a four-year series of orb sightings in the northeastern U.S. that the Bureau's own agents witnessed first-hand, and the first-person record of the October 2023 Western US Event. Also included: the CIA's 1953 Robertson Panel report in less-redacted form, NASA's Gemini-era crew debriefings, and the 1962 Cronkite–Cooper interview audio.

Document Release
Featured

PURSUE Release 02: Department of War declassifies 64 more UAP files

Exactly 14 days after PURSUE Release 01, the U.S. Department of War publishes a second tranche of declassified UAP records through war.gov/UFO: 51 sensor videos (the DOW-UAP-PR050–PR099 series), 7 NASA crew audio files, and 6 documents. The centerpiece is a first-person USPER narrative from a currently-serving senior U.S. intelligence officer describing a one-hour, multi-witness UAP encounter from a U.S. military helicopter in late 2025.

Document Release
Featured

PURSUE Release 01: Department of War declassifies 160 UAP files

The Trump administration launches PURSUE — the Presidential Unsealing and Reporting System for UAP Encounters — and the Department of War publishes 160 declassified UAP-related files in the first tranche: 117 PDFs, 29 sensor videos, and 14 photographs spanning 1944 to 2026. Secretary of War Pete Hegseth says the goal is 'maximum transparency.'

Sighting
Featured

The FBI's orb files: four years of phenomena in one corner of the northeastern U.S. — witnessed by the Bureau's own agents

PURSUE Release 03 declassifies the FBI's investigation of recurring orb phenomena in one sparsely populated area of the northeastern United States: four authenticated eyewitness videos spanning November 2021 to July 2025 — 'Triangle Orbs,' 'Red Orb Rotation,' 'Orbs Over the Pond,' and the 'Northeastern Orb Sighting' — plus seven investigative records. The standout: an FD-1057 documenting two FBI special agents' own first-hand UAP observation during a November 2024 site survey. The Bureau assesses the civilian witnesses as 'highly credible.'

Sighting
Featured

Lake Huron: F-16C engages and downs an unidentified object

Cockpit/sensor footage from the February 12, 2023 U.S. Air National Guard F-16C engagement over Lake Huron, Michigan — the third of four shootdowns that month in the wake of the Chinese surveillance-balloon incident. AARO has characterized the underlying object as 'a benign hobbyist or research balloon' but the engagement footage itself is published for the first time in PURSUE Release 02.

Sighting
Featured

DOW-UAP-PR051: 'Syrian UAP instant acceleration', MQ-9 Reaper weapons-quality lock

Released as the kinematic standout of PURSUE Release 02, DOW-UAP-PR051 records a 2021 encounter on the Jordan-Syria border in which a U.S. Air Force MQ-9 Reaper drone achieves a weapons-quality lock on an unidentified object before that object exhibits instantaneous acceleration and abrupt directional changes that, per AARO's mission report, exceed the publicly disclosed performance envelope of any known crewed or uncrewed aerial system.

Report
Featured

New York Times reveals the Pentagon's AATIP program

Helene Cooper, Ralph Blumenthal, and Leslie Kean publish a front-page New York Times investigation revealing the existence of the Department of Defense's Advanced Aerospace Threat Identification Program. The story includes a release of the 'FLIR1' video and on-the-record statements from former AATIP director Luis Elizondo.

Sighting

GO FAST: the third Pentagon video — and the parallax assessment that reframed it

A Navy ATFLIR clip appears to show a small object streaking just above the Atlantic. Officially released in April 2020 alongside FLIR1 and GIMBAL, GO FAST became the clearest case study in how sensor geometry can mislead: analyses using the video's own displayed data — including AARO's published assessment — put the object several thousand feet up, moving far slower than it appears.

Sighting
Featured

GIMBAL: the Navy's rotating-object video, still unresolved

An F/A-18F crew from the USS Theodore Roosevelt's air wing records an infrared object with no visible exhaust that appears to rotate in flight while the crew reports a formation of additional objects on their situational-awareness display. One of three videos the Pentagon officially confirmed authentic in April 2020 — and the only one of the three with no published resolution.

Frequently asked

What flight characteristics does the ODNI describe?
The June 2021 ODNI Preliminary Assessment lists five recurring characteristics: 'remaining stationary in winds aloft', 'moving against the wind', 'manoeuvring abruptly', 'moving at considerable speed', and 'no identifiable means of propulsion'. The same taxonomy is reproduced in subsequent AARO reporting.
What is the Knuth et al. 2019 paper?
A peer-reviewed paper in Entropy that derives quantitative estimates of the accelerations, velocities, and implied propulsion power for a small set of well-documented UAP cases. It is the first widely-cited physics treatment of the modern record.
What about the Loeb & Kirkpatrick paper?
A 2023 Harvard Center for Astrophysics preprint co-authored by Galileo Project founder Avi Loeb and then-AARO director Sean Kirkpatrick, titled 'Physical Constraints on Unidentified Aerial Phenomena'. It establishes the physical envelope inside which observed UAP behaviour can lie before requiring physics outside the standard model.
What does trans-medium mean?
Transition between atmosphere and water (or vice versa) without breaking up. The Navy-pilot record — particularly the 2004 Nimitz Tic Tac case — includes reported observations of UAP entering and exiting water without conventional splash or deceleration profiles. Whether the observations support the physical claim is contested.
Where's the AIAA review?
Powell et al. 2024, 'The Reported Shape, Size, Kinematics, Electromagnetic Effects, and Presence of Sound of UAP from Select Reports, 1947–2016', published in AIAA Aviation 2024. The most comprehensive statistical synthesis to date. Linked from the Research library page.

Canonical reading on this topic

Non-fiction titles by named witnesses, Pentagon insiders, and investigative journalists referenced in this archive.

  • UFOs: Generals, Pilots, and Government Officials Go on the Record
    Leslie Kean · 2010
  • In Plain Sight: An Investigation Into UFOs and Impossible Science
    Ross Coulthart · 2021
  • UFO: The Inside Story of the US Government's Search for Alien Life Here—and Out There
    Garrett M. Graff · 2023

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International equivalents

How other governments handle UAP

U.S. material is the single largest body in the public UAP record, but it isn't the only one. France's GEIPAN has run a transparent case database since 1977; the UK MoD released ~60,000 pages between 2008 and 2017; Japan's evolving track is the program currently moving fastest in 2026. Every state-run UAP-investigation body with a public archive — fifteen countries to date — is catalogued in one place.

Browse international government archives →

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