sending bomb threats to 2,000 US and 400 UK schools
One fake bomb threat led to a United Airlines jet being quarantined for four hours at San Francisco International Airport as the warning was investigated.
The document said the incidents took place between January and August 2018. The Department of Justice said if Mr Vaughn was convicted of all 11 charges he faced,he could go to jail for 80 years.
Cyber-security expert Brian Krebs, whose digital detective work helped to unmask Duke-Cohan, said the identity of his claimed US conspirator had remained a mystery for some time.
Clues to his identity emerged when the user database from gaming firm Blank Media Games was stolen and made available online.
An email address seen in the stolen data dump resembled one of the aliases Mr Vaughan is alleged to have used, wrote Mr Krebs, and showed that whoever owned that account logged in regularly from North Carolina.
Earlier this week, Mr Vaughan was arrested at his home in Winston-Salem, North Carolina.