An Alaska Airlines flight en route to Seattle landed at Los Angeles International Airport a few minutes after takeoff Wednesday because of cabin pressure problems, an airline official said.
No one was injured and the 121 passengers who had left from California's Ontario International Airport were put on other flights to Seattle, said Alaska Airlines spokeswoman Amanda Tobin.
It was the second Alaska flight in as many days to fail to reach its destination because of pressurization problems.
Flight 397 left Ontario International at 6:37 a.m. The MD-80 landed at Los Angeles International, about 35 miles away, at 7:16 a.m. after crew members noticed the pressurization problem.
"There was an indication that the cabin may have been pressurizing at a slower rate than expected," Tobin said.
On Tuesday, an Alaska flight returned to Portland International Airport after the cabin's oxygen masks dropped 15 minutes into a flight to Denver.
Alaska Airlines has had three similar problems in the last two months. The incidents involved different types of aircraft, however, and Tobin said they appear to be unrelated. The Seattle-based airline has begun pressurization inspections of its entire fleet of 110 aircraft, she said.
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No common cause for the incidents has been found so far.
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An altitude warning alarm sounded when Flight 690 reached 33,000 feet, indicating the air pressure in the cabin was lower than it should be.
Earlier this year, Alaska ordered a fleet-wide inspection of its planes' air pressure systems after a series of similar cabin pressure problems.