No one was injured in either incident.

The Boeing 737-700 involved Thursday appeared to have been inadvertently moved about 3 feet by a push tug, which is used to move aircraft to and away from gates, Alaska Airlines spokeswoman Amanda Tobin said.

As a result, the right engine hit a baggage loader and the entry door on the left side of the plane collided with the jetway at Gate D2, she said.

Damage to the aircraft was considered minor and the plane's engines were not on at the time, Tobin said. The push tug was being operated by an employee of Menzies Aviation, who immediately alerted Alaska Airlines.

Four people had boarded Flight 808 bound for Dallas-Fort Worth around 11:30 a.m., when the incident occurred. They exited the plane and, with other passengers, boarded another aircraft brought in for that flight, Tobin said. Flight 808 was delayed slightly, she said.

Alaska Airlines informed the Federal Aviation Administration and the Port of Seattle. The airline was investigating and the worker involved was suspended, Tobin said.

"We are looking diligently at the cause," she said, adding later, "I can't speculate on what transpired, but the thorough investigation will provide more."

On Dec. 26, an Alaska Airlines MD-80 heading for Burbank, Calif., lost cabin pressure at 26,000 feet because of a foot-long gash in its fuselage.

Investigators said the in-flight scare occurred after a ramp worker struck the airplane with a baggage-handling vehicle while it was at the gate. The worker did not immediately report the accident.

The hit caused a crease in the airplane's aluminum skin, which opened up to a 12- by 6-inch gash as the plane reached 26,000 feet.

The plane landed safely. Alaska said the Menzies Aviation worker involved in that incident was suspended and others were given safety briefings.

Alaska Airlines hired Britain-based Menzies to provide baggage handling and other ramp services after laying off nearly 500 ramp workers at Sea-Tac in May. In a statement then, Alaska said hiring Menzies would save $13 million a year.

Menzies' top safety executives are scheduled to be in Seattle on Monday to begin a 90-day evaluation of ramp services the company provides to Alaska Airlines at Sea-Tac.

Alaska Airlines, a subsidiary of Seattle-based Alaska Air Group Inc., is the nation's ninth-largest carrier. Alaska and its sister airline, Horizon Air, fly to more than 80 cities in the United States, Canada and Mexico.