(CNN) United Airlines now plans to cancel all flights involving Boeing 737 Max planes until August — a month longer than previously announced.
The airline expects to cancel roughly 2,400 flights in June and July, a large chunk of the busy summer travel season.
"We won't put our customers and employees on that plane until regulators make their own independent assessment that it is safe to do so," United said in a statement. The company added that it will continue trying to automatically rebook affected customers on other flights.
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United said in April that it would cancel all flights through "early July" because of the Boeing 737 Max grounding. The latest extension is through August 3.