Seattle ? Six Alaska Airlines passengers have sued the airline and the company that handles its Seattle-Tacoma International Airport ground operations, claiming they suffered “severe physical and emotional injuries” when a hole ripped open in the plane’s side wall on a Dec. 26 flight.

The lawsuit, filed Friday in Los Angeles Superior Court, alleges the damage to Flight 536 from Seattle to Burbank, Calif., was caused by negligence on the part of Alaska and Menzies Aviation.

Alaska hired Menzies in May to take over its baggage handling and other ramp operations at Sea-Tac Airport.

A preliminary investigation by the National Transportation Safety Board found that the MD-83 was bumped on the ground by a baggage loader operated by a Menzies worker.

The worker did not report the incident, and the plane was allowed to depart. Shortly after takeoff, when the plane reached 26,000 feet, a 1-foot by 6-inch hole opened in the fuselage, causing the plane to depressurize.

The pilots made an “emergency descent,” according to the NTSB, and “an uneventful landing” at Sea-Tac followed.