Witnesses said they heard a flight attendant screaming "Help me, help me!" from the rear of the plane. Passengers reacted quickly, running to the back and tackling a man who was trying to open an emergency door.
The plane landed safely at Omaha's Eppley Airport, where the "unruly" passenger was escorted off, a Southwest spokesperson said. Flight 722 finally arrived in Sacramento about 2 hours late.
The FBI is investigating the incident.