The Transportation Security Administration (TSA) said the co-pilot become concerned Osbon was exhibiting erratic behavior during the flight. The captain, according to TSA, then exited the cockpit during flight.
As a result, the co-pilot locked the door and when the captain attempted to enter the cockpit, he was subdued by passengers, TSA said.
The plane, with 141 passengers and crew members, was en route from New York City to Las Vegas. No one was seriously hurt.