The Pittsburgh Tribune-Review reports 34-year-old Marc Malone, of Hogansville, Ga., pleaded guilty before a federal judge in Pittsburgh on Tuesday.
Malone was charged by Allegheny County police with public drunkenness after the flight landed at Pittsburgh International Airport on Oct. 10.
The FBI charged him last month with flight crew interference alleging he began acting strangely, saying "I need to get off now" and "I want to get out" while moving toward the front of the plane. The FBI says Malone pushed a flight crew member, swore and threatened the crew after they subdued him with plastic "flex" cuffs.
Malone will be sentenced May 8.