American Airlines is pushing back the planned return of its Boeing 737 Max jets until early September, two weeks longer than the airline had previously expected.
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American over the weekend removed its 24 Max jets from the flight schedule through Sept. 3.
The plane has been grounded around the world since mid-March, after the second of two crashes that killed a combined 346 people in Indonesia and Ethiopia.
Boeing is updating anti-stall software implicated in the crashes. The aircraft maker hopes to conduct a test flight in the coming weeks to demonstrate the changes for the Federal Aviation Administration.
American is canceling about 115 flights a day because of the grounding of its Max jets.
Southwest and United have dropped their Max jets from schedules into early August.