United Flight 223 was diverted to Denver at 5:10 p.m. Saturday after a man who tried to open a side exit door and gain access to the doorway of the cockpit, was restrained by seven passengers. The offender, who has not and police who met the plane at the gate took the passenger into custody.
Wikipedia: United Airlines | Denver International Airport
New York Daily News Passengers tackle ‘unruly’ New York man on United Airlines flight after he knocked on cockpit door
KTNV United flight from D.C. to Las Vegas diverted due to passenger disturbance