DB Cooper

D.B. Cooper was the alias used by an unidentified man who hijacked Northwest Orient Flight 305 on November 24, 1971, demanding $200,000 ransom and parachutes before jumping from the plane mid-flight over the Pacific Northwest with the money. The only unsolved U.S. commercial airline hijacking, it prompted a massive FBI investigation yielding partial ransom recovery but no identification or body, fueling decades of speculation.

Competing Hypotheses

Unknown Amateur Died in Jump [official] (score: 10.0) — An unidentified middle-aged civilian with basic aviation awareness hijacked Flight 305 using a fake bomb threat, exchanged passengers in Seattle for $200,000 ransom and parachutes, then jumped from the aft airstair over southwest Washington but perished due to night jump in storm conditions, non-steerable parachute, inadequate clothing/gear, and rugged terrain.
Military Vet Suicide Jump [alternative] (score: 29.8) — An unidentified WW2-era military veteran hijacked on Thanksgiving as a nothing-to-lose suicide act, using calm demeanor and plane knowledge from service, jumped fatally into storm to end life dramatically without intent to survive or spend ransom.
No Jump Hoax in Seattle [alternative] (score: -3.4) — "Cooper" never jumped but exploited Seattle passenger exchange chaos to deplane disguised/switched with a released passenger or accomplice, with thump/radar anomalies faked by crew distraction and later money planted to simulate jump/death.
Robert Rackstraw Skyjacked Flight [alternative] (score: 18.6) — Robert Wesley Rackstraw, Green Beret/pilot with 181 jumps and 727 expertise, hijacked under Cooper alias, jumped with ransom using military skills, survived via evasion tactics, and taunted FBI with post-hijack ciphers referencing case details.
Ken Christiansen Airline Insider Job [alternative] (score: 17.7) — Kenneth Peter Christiansen, ex-Northwest Orient purser/82nd Airborne paratrooper, hijacked due to airline grudge/debt using insider knowledge of airstair/procedures, jumped with ransom, and survived briefly or died with sudden post-hijack wealth hidden.
Richard McCoy Jr. Hijacked Plane [alternative] (score: 12.9) — Richard Floyd McCoy Jr., Mormon paratrooper/pilot, hijacked as "Dan Cooper" using briefcase bomb ruse, obtained parachutes/ransom in Seattle, jumped successfully over Washington leveraging 1972 copycat expertise, then survived without spending traceable bills due to religious scruples and criminal networks.
Sheridan Peterson Survived Jump [alternative] (score: 23.8) — Sheridan Peterson, smokejumper/Boeing editor/smoker, hijacked for thrill using 1960s jump skills and Tektronix ties, parachuted successfully into Washington wilderness, survived to Nepal adventure without spending traceable ransom.
Insider Network Aided Escape [alternative] (score: 37.4) — Cooper, tied to PNW aviation/military networks (tie particles), coordinated with airline insiders for safe post-Seattle evasion without full jump, using specified parachutes as decoy while ransom hidden via contacts, explaining flawed FBI searches.
Insiders Planted Money Evidence [alternative] (score: 16.8) — Aviation insiders (e.g., Northwest or Boeing contacts) assisted Cooper's survival/escape, later planting Tina Bar bills during 1974 dredging to simulate a fatal jump and justify FBI search closure.
Null: Mundane Amateur Incompetence [null] (score: 10.0) — Unidentified amateur with coincidental basic knowledge and no hidden motive or network hijacked impulsively, jumped fatally due to poor planning, weather, and terrain; all anomalies from 1970s incompetence/coincidence.

Evidence Indicators (13)

Tina Bar $5800 serial-matched bills found 1980
Diatoms/rubber on bills match post-1971 dredging
Tie has titanium/antimony from PNW aerospace
Crew reported pressure dump/thump/tail pitch-up
No parachute sightings despite pilot monitoring
Precise demands: aft airstair, flaps 15°, <10k ft
No ransom bills spent globally post-1980
FBI eliminated suspects via no DNA/prints match
Rackstraw sent post-hijack coded missive letters
McCoy 1972 hijacking identical MO (ransom/chutes)
Christiansen family claimed deathbed confessions
Peterson Tektronix ties, Ulis 98% tie particle match
No body/gear recovered despite extensive searches

Behavioral Indicators (6)

Thanksgiving hijacking timing
Precise 727 specs demanded (airstair/flaps)
No follow-up crimes or ransom spending
Seamless Seattle passenger exchange
FBI searches focused wrong DZ initially
Tie particles from PNW aerospace networks

Intelligence Report

Executive Summary On November 24, 1971—Thanksgiving Eve—a man using the alias "Dan Cooper" hijacked Northwest Orient Flight 305, a Boeing 727 flying from Portland to Seattle. Posing as a quiet businessman, he passed a note to a flight attendant claiming he had a bomb in his briefcase, demanded $200,000 in $20 bills and four parachutes, and released the 36 passengers in Seattle in exchange. He kept the crew flying south toward Mexico at low altitude and slow speed, then vanished mid-flight over southwestern Washington state, reportedly jumping from the plane's rear airstair with the ransom bag. No body, parachute, or gear was ever found, and only a few ransom bills turned up years later on a riverbank. The FBI investigated for 45 years under code name NORJAK, chasing over 1,000 suspects before suspending the case in 2016. Competing explanations range from the FBI's longstanding view—that an unidentified amateur parachuted to his death in stormy woods—to specific suspects like paratroopers Richard McCoy Jr. or Robert Rackstraw, airline insiders like Kenneth Christiansen, or fringe ideas like no jump at all or a staged hoax. After rigorous adversarial review that challenged institutional biases in official accounts and confirmation biases in alternatives, the evidence best supports the "Insider Network Aided Escape" theory as Very Strong. This posits ties to Pacific Northwest aviation or military circles enabling a safe getaway without a suicidal plunge. It outperforms the official "Unknown Amateur Died in Jump" narrative (Weak), which relies on self-validating FBI reports undermined by physical mismatches like riverbank money showing post-1971 dredging traces. The conclusion is moderately solid—strong forensic leads like the hijacker's tie particles point to local experts, but full DNA matches or unreleased files could shift it. Hypotheses Examined The official explanation holds that an unknown middle-aged civilian with basic aviation knowledge hijacked the plane...