DALLAS (CBSDFW.COM) – Southwest Airlines cancelled about 40 flights Sunday due to engine fan blade inspections, the company said. This is following last week’s deadly incident aboard a flight due to an engine failure.

According to the company, the cancellations were out of almost 4,000 flights scheduled for the day.

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The inspections stem from Southwest’s accelerated engine fan blade inspection program that was announced Tuesday night, the company said.

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Last Tuesday, one person died when part of an engine exploded on a Southwest flight on its way to Dallas.

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The National Transportation Safety Board continues to investigate what happened to the engine as debris broke a window, killing a passenger.