Joseph David Emerson, 44, an Alaska Airlines pilot, was riding as a standby employee passenger in the cockpit "jump seat" of Sunday's flight, en route from Everett, Washington, to San Francisco, when the airborne altercation occurred, authorities said.
After a brief scuffle inside the flight deck with the captain and first officer, Emerson ended up being restrained by members of the cabin crew and was arrested in Portland, Oregon, where the flight was diverted and landed safely.
He was charged in Oregon state court on Tuesday with 83 counts of attempted murder - one for every crew member and passenger on the plane besides himself - and a single count of endangering an aircraft.
He pleaded not guilty to those charges through his attorney at a brief arraignment hearing in Multnomah County Circuit Court in Portland.
Emerson was charged in a separate federal criminal complaint with one count of interfering with flight crew members and attendants.
The charging documents in both cases were filed with sworn affidavits from investigators outlining a harrowing sequence of events that came close to shutting down hydraulic operation and fuel to both engines of the twin-jet aircraft, an Embraer 175.
According to the affidavits, Emerson told police after his arrest that he was suffering a mental crisis during the incident and had struggled with depression for the past six months.
The court documents said he also told police that he had taken "magic mushrooms" for the first time, ingesting them about 48 hours before boarding the plane.
Alaska Air Group, the airline's parent company, said in a statement that at no time during the check-in or boarding process did employees observe any signs of impairment that would have led them to prevent Emerson from flying.
Court documents gave no indication of whether investigators had confirmed any drug or alcohol use by the suspect, though one of the arresting officers told investigators that Emerson did not appear "outwardly under the influence of intoxicants."
Medical research has shown that psilocybin, a naturally occurring hallucinogen found in certain mushroom varieties known as "magic mushrooms," to be beneficial as a treatment for anxiety, depression and other mental disorders.
The two pilots who were at the controls of Flight 2059 told investigators, according to affidavits, that Emerson had started out chatting with them casually, before suddenly hurling his radio headset across the cockpit and saying: "I'm not OK."
At that point, he reached up and grabbed two red-coloured fire-suppression handles, pulling them downward, an affidavit said.
A scuffle ensued as one of the two pilots quickly clutched Emerson's wrist to keep him from fully engaging the handles, while the other declared an in-flight emergency, before Emerson abruptly quieted down again and left the cockpit.
The flight crew later told investigators that had Emerson managed to fully deploy the shut-off handles, the plane was "seconds away" from being turned into a glider.
After leaving the cockpit, Emerson was escorted to the back of the plane, placed in a flight attendant's seat and was fitted with handcuffs, having warned the cabin crew: "You need to cuff me right now or it's going to be bad," according to affidavits.
A flight attendant cited in the affidavits was quoted as telling authorities she overheard Emerson say: "I messed everything up," and that he had stated that he had "tried to kill everybody."
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