(CNBC) — American Airlines is extending cancellations for the Boeing 737 Max aircraft through August 19, a key summer travel period, as the jets remain grounded.

The cancellations amount to about 115 flights per day, roughly 1.5% of American’s total flying per day in the summer, the airline said. They come after the Max’s anti-stall software was implicated in an Ethiopian crash in March that killed 157 people.

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