Witnesses said the man claimed he was entitled to three seats because he couldn't get an upgrade, although the seats were already assigned.

United Airlines CEO Oscar Munoz says he has no plans to step down after a ticket-holding passenger was violently forced off an overbooked flight.

Shares of United Continental Holdings Inc. closed at $71.52 Monday and dropped to $68.65 after North American markets opened Tuesday morning.

"He raised his voice and refused to comply with crew member instructions."