The D.B. Cooper Vanishing

In Seattle, Flight 305 landed at 5:46 p.m. and parked on a partially lit runway away from the terminal. The $200,000 came from Seattle First National Bank as 10,000 unmarked $20 bills — a bag weighing about 19 pounds — most of them carrying serial numbers beginning with "L," indicating issuance by the Federal Reserve Bank of San Francisco. The FBI photographed every bill on microfilm. Mucklow carried the money aboard; Cooper released all 36 passengers and, one by one, most of the crew.

When he complained the cash arrived in a cloth bag rather than the knapsack he'd demanded, he improvised: using a pocket knife, he cut the canopy from one of the reserve parachutes and stuffed money into the empty container. Then he gave the crew a flight plan that read like a checklist written by someone who knew the airframe cold:

• Southeast toward Mexico City, refueling in Reno
• Minimum airspeed without stalling — about 100 knots
• Maximum 10,000 feet altitude
• Landing gear down, wing flaps at 15°
• Cabin unpressurized
• Aft airstair extended

The 727 was one of the only passenger jets you could parachute from cleanly, and the aft stair could be lowered in flight from a switch the cockpit couldn't override — a feature so obscure that civilian crews weren't even told it existed. Cooper knew it. Around 8:00 p.m. a cockpit warning light showed the airstair had deployed. At roughly 8:13 p.m. the tail pitched sharply upward, then settled; First Officer Bill Rataczak later placed that moment near Portland's northern suburbs. The FBI reproduced the same motion by shoving a 200-pound sled out the aft airstair of the very same aircraft in the very same configuration.

Mucklow was the last person to see him. As she walked to the cockpit and turned to close the curtain partition, she saw Cooper standing in the aisle, tying what looked like the money bag around his waist. From takeoff to that moment, four or five minutes had passed. Two F-106 fighters and a diverted T-33 trainer shadowed Flight 305, flying "S" patterns to stay behind the slow 727 and out of Cooper's view. None of the pilots saw anyone jump. Radar never detected a deployed parachute. A black-clad man dropping into a moonless, cloud-covered night over unlit forest is, it turns out, nearly impossible to see.

For a man who demanded his notes back and refused to leave even an empty matchbook — Mucklow used his last match to light a cigarette, and he made her return the spent book — Cooper left a surprising amount of forensic material in seat 18-E. What survived, and what the FBI managed to lose, tells its own quietly maddening story:

• A black clip-on tie and a gold, mother-of-pearl tie clip. The tie was sold exclusively at JCPenney and discontinued in 1968. It became the case's most durable piece of physical evidence.
• A single strand of brown Caucasian head hair on the headrest, preserved on a microscope slide for future comparison — then discovered lost when the FBI tried to build a DNA profile in 2002. A second limb hair was destroyed early for lacking useful microscopic detail.
• Eight Raleigh filter-tipped cigarette butts from the armrest ashtray, sent to the FBI lab, returned to the Las Vegas field office, and destroyed there before anyone extracted DNA.
• Two parachutes, one a reserve that had been opened with three shroud lines cut from the canopy. One reserve Cooper had been given was a sewn-shut classroom training dummy — a chute an experienced jumper would have spotted instantly, which fed the FBI's belief that Cooper was no expert skydiver.

In 2009, a group of citizen sleuths calling themselves the Cooper Research Team — including a Burke Museum paleontologist, a scientific illustrator, a computer scientist and a metallurgist — ran the tie under an electron microscope. They found particles of unalloyed titanium, along with bismuth, antimony, cerium, strontium sulfide, aluminum, and titanium-antimony alloys. In the 1970s, pure titanium was rare and specialized, used at aircraft fabrication plants or chemical companies handling extremely corrosive substances. Cerium and strontium sulfide showed up in Boeing's supersonic-transport project and in Portland cathode-ray-tube factories. The fingerprint pointed toward aerospace manufacturing or a metals plant. It's suggestive. It's not a name.

February 10, 1980. Eight-year-old Brian Ingram was raking a Columbia River beach called Tina Bar — about nine miles downstream of Vancouver — to build a campfire when he uncovered three bundles of $20 bills. About $5,800 total, disintegrated by weather but still bound in rubber bands, arranged in the same order they'd been handed to Cooper. FBI technicians confirmed the serial numbers: two packets of one hundred bills and a third of ninety. It remains the only confirmed piece of ransom ever found outside the aircraft. In 1986 the recovered bills were split between Ingram and the airline's insurer; Ingram later sold fifteen of his at auction for about $37,000.

Here's where it gets stranger, not clearer. An Army Corps of Engineers hydrologist argued the rounded, matted bills had been "deposited by river action." But agent Ralph Himmelsbach countered that free-floating bundles should have washed up within a couple of years, before the rubber bands rotted — and Portland State geologist Leonard Palmer found sediment layers indicating the bills arrived at Tina Bar only after a 1974 dredging operation, well after the hijacking. Then, in 2020, an analysis of diatoms — microscopic algae — on the bills found only springtime-blooming species, meaning the money entered the water months after the November hijacking, not that night. The physical evidence and the geological evidence still don't agree, and neither one puts the money where a simple story would.

The FBI's active investigation ran from the night of the hijacking to July 8, 2016 — 45 years — producing a 66-volume case file and more than a thousand "serious suspects," and reaching no definitive conclusion about who Cooper was. The file is preserved at FBI headquarters and open to the public.

They tried everything the era allowed. Twelve days after the jump, J. Edgar Hoover approved the use of an Air Force SR-71 Blackbird to retrace and photograph the flight path; it flew five times, all foiled by poor visibility. Initial projections placed the drop zone near Lake Merwin, southeast of Ariel, Washington. After the spring thaw of 1972, some 200 soldiers from Fort Lewis, plus National Guardsmen and volunteers, combed Clark and Cowlitz counties on foot for 18 days in March and another 18 in April. A marine-salvage firm ran a submarine along the 200-foot depths of Lake Merwin. A submarine, for a man with a briefcase.

Then the geometry moved. Continental Airlines pilot Tom Bohan, flying four minutes behind Flight 305, told the FBI its drop-zone math used the wrong wind direction. Recalculations shifted the likely landing area east, toward the Washougal River watershed — where Himmelsbach wrote in 1986, "if I were going to look for Cooper... I would head for the Washougal," and where the FBI believes any remaining physical clues were probably destroyed by the 1980 eruption of Mount St. Helens.

The bureau's internal May 1973 profile read Cooper as a careful, methodical planner, not a common criminal — probably a military-trained parachutist and Air Force veteran familiar with Seattle. He recognized Tacoma from the air and correctly noted McChord Air Force Base sat a 20-minute drive from Sea-Tac, a detail most civilians wouldn't know. Larry Carr, who led the team from 2006, later revised that read: not a paratrooper, he thought, but perhaps an Air Force cargo loader with just enough jump exposure to try it and not enough to survive it. It's a plausible sketch of a person. It has never been attached to one.

The agents who worked the case never agreed on whether Cooper lived. That disagreement is the honest center of the whole thing.

On the survived side: J. Earl Milnes, the Special Agent in Charge in Seattle at the time, said in 1976 that Cooper "got away with it," citing the 727 as a safe jump platform, the terrain between Woodland and Vancouver as "wide open spaces, ideal for parachute landings," and adequate weather. A senior colleague put it more vividly the same year, anonymously in The Seattle Times: "I think he made it. I think he slept in his own bed that night." Parachute rigger Earl Cossey — who packed all four chutes — said anyone with six or seven practice jumps could have pulled it off, though without jump boots Cooper likely mangled an ankle on landing. And Himmelsbach, originally a skeptic, revised his own estimate to a 50 percent survival chance after every one of Cooper's copycat jumpers lived.

Those copycats matter, because they ran the experiment Cooper couldn't. Himmelsbach named three:

• Martin McNally bailed over Indiana at night with only a front reserve and no protective gear, at nearly double Flight 305's airspeed; the jolt ripped his $500,000 away, "yet he had landed unharmed except for some superficial scratches and bruises."
• Frederick Hahneman parachuted into a Honduran jungle at night and surfaced a month later at the U.S. embassy in Tegucigalpa.
• Richard LaPoint jumped in trousers, a shirt and cowboy boots into freezing January wind over northern Colorado and landed in the snow.

On the died side: Larry Carr cited the pitch-black rain, a 172 mph wind in Cooper's face, loafers instead of boots, no helmet, and a 15°F wind chill at 10,000 feet. Carr: "Diving into the wilderness without a plan, without the right equipment, in such terrible conditions, he probably never even got his chute open." Thomas Manning, who ran the ground searches, believed Cooper drowned in Lake Merwin, his shroud lines snagged on a sunken log. Carr's strongest circumstantial point — that no ransom ever turned up in circulation — runs straight into the Tina Bar diatoms, which say the money moved through water in spring, not that November night. The timeline stays open.

The FBI ran more than a thousand serious suspects — soldiers, skydivers, con men, deathbed confessors, brothers and uncles turned in by their own families. The tie yielded only partial DNA profiles (one large sample, two small, hard to draw firm conclusions from), and the bureau itself cautioned nothing proved the DNA even came from Cooper. Every named suspect tested against it was eliminated by non-match or fingerprints.

A short tour of the ones who got closest:

• Duane Weber, a WWII veteran and career burglar whose widow said his last words were "I am Dan Cooper." Himmelsbach admitted Weber fit the physical description and criminal background, but the FBI cleared him in 1998 when his fingerprints didn't match, and his DNA later failed the tie samples too.
• Kenneth Christiansen, a former paratrooper and Northwest Orient purser who drank bourbon and smoked; the FBI held he couldn't be a prime suspect, citing a poor match to eyewitness descriptions and no direct evidence.
• Richard McCoy Jr., who staged the most famous copycat five months later — but three flight attendants and the ticket agent all said McCoy wasn't their man, and he was home in Utah for Thanksgiving.
• Lynn Doyle Cooper, Sheridan Peterson, and the much-investigated Jason Langseth — all cleared by DNA non-matches to the tie.

Even the name is a mistake. The alias on the ticket was "Dan Cooper." Oregon Journal reporter James Long, rushing a deadline, misrecorded it as "D. B. Cooper"; UPI republished the error, and it stuck to history. "Dan Cooper" itself may trace to a French-language Belgian comic — a fictional Royal Canadian Air Force test pilot, one cover of which shows him skydiving — that was never translated into English or imported to the U.S. That's either a clue about the hijacker's background or a coincidence nobody can resolve.

The resolution criterion here is unusually clean. Close the case with any one of three things: a DNA match between the tie's partial profiles and an identified person, confirmed ransom bills surfacing in traceable circulation, or recovery of the parachute or remains with a verifiable physical link to Flight 305. None has happened. The Cooper hijacking remains the only documented unsolved case of air piracy in the history of commercial aviation.