**Stars and Stripes — Richard McCoy** — FBI excluded McCoy based on physical description mismatch; McCoy hijacked United Airlines Flight 855 April 7, 1972; demanded $500,000 and four parachutes; convicted of air piracy; escaped prison; killed in 1974 shootout with federal agents in Virginia Beach; widow admitted helping plan 1972 hijacking but denied McCoy was Cooper. [https://stripes.com/history/2024-02-20/richard-mccoy-db-cooper-skyjacking-13064153.html]
**The Conversation — Aviation security aftermath** — Cooper vane (mechanically prevents aft stair lowering in flight) mandated by FAA; also established legal framework for airport screening: *United States v. Lopez* (1971) upheld hijacker profile; *United States v. Epperson* (1972) upheld magnetometers; *United States v. Davis* (1973) upheld searching for weapons. Broader wave of 1970s hijackings, not Cooper alone, drove the major screening changes. [https://theconversation.com/d-b-cooper-the-changing-nature-of-hijackings-and-the-foundation-for-todays-airport-security-185562]
**History.com — Kenneth Christiansen, Robert Rackstraw, tie particles** — Christiansen: Northwest purser, paratrooper, bought house in cash post-1971, brother claims deathbed remark; Rackstraw: pilot/paratrooper, named in 2016 book, died 2019; tie analysis: more than 100,000 microscopic particles including bismuth and unalloyed titanium; 2025 FBI file release; Sheridan Peterson (former Boeing engineer/skydiver, said to be in Nepal). [https://www.history.com/articles/who-was-d-b-cooper]
**Everything-Everywhere.com — General case facts** — Additional confirmation of hijacking chronology, “Dan Cooper” Belgian comics origin theory, Cooper’s seat and clothing, the demand for a refueling truck, crew retained after passenger release, the flight south’s conditions, the airstair deployment. Used as corroborating source, not as a citable primary reference; no citations in original. [https://everything-everywhere.com/the-legend-of-d-b-cooper/]
**Material uncertainties:**
– The exact seat number (18C vs. 18E) varies by source. The difference is minor and does not affect the substance of the account; it is noted here as an unresolved discrepancy.
– The claim that one reserve parachute was a non-functional training dummy is confirmed in multiple sources. Whether Cooper knew it was non-functional is not established.
– The Tena Bar bill condition—approximately 30 of 290 in good condition—comes from HistoryLink’s reporting. The FBI’s own characterization of bill condition may differ slightly.
– The diatom study from 2020 suggesting the bills entered the water months after the hijacking is described based on secondary reporting. The original study was not directly reviewed for this article.
– The tie’s DNA profile: described as partial and insufficient for a conclusive match. The FBI’s exact language about this finding varies by report; “partial DNA profile” and “unable to conclusively link” reflect multiple secondary sources.
– The tie’s microscopic particle analysis (bismuth and unalloyed titanium) is sourced from History.com reporting on recent FBI file releases. The original FBI documents were not directly accessed.
– The 2023 developments involving McCoy’s children and a private researcher are noted as unconfirmed and not evaluated by the FBI in any public statement reviewed for this article.
– The Belgian comic strip origin theory for the “Dan Cooper” alias is a widely reported hypothesis, not a confirmed finding.
– The claim that Cooper’s case is “the only unsolved airplane hijacking in American history” is a common characterization but not a phrase from the FBI or a legal or regulatory definition.
– The current FBI case status (2026): No “solved” or identification finding has been issued. The 2016 resource redirection remains the most recent formal FBI action on the case status.