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What: Frontier Airlines Airbus A319-100 en route from Denver,CO to Phoenix,AZ
Where: Denver
When: Aug 29th 2010
Who: 62 passengers
Why: While en route, the plane got an alert that the left engine was low on oil. The pilots shut down the engine and returned to Denver where they made a safe landing.
Maintenance handled the problem, and the flight took off again an hour late.