FILE - In this image taken from video, the engine of United Airlines Flight 328 is on fire after after experiencing "a right-engine failure" shortly after takeoff from Denver International Airport, Saturday, Feb. 20, 2021, in Denver, Colo. Federal safety officials are updating their investigation into the engine failure on the United Airlines plane that sent parts of the engine housing raining down on Denver-area neighborhoods last month. The National Transportation Safety Board said Friday, March 5, that a microscopic exam confirmed that a fan blade that snapped off had telltale signs of fatigue — tiny cracks caused by wear and tear. (Chad Schnell via AP)
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