It’s been a devastating few months for leading aircraft manufacturing company Boeing after their 737 aircraft were involved in two tragic plane crashes that killed nearly 350 people.

As a result, American Airlines recently announced it will be continuing its flight cancellations for Boeing 737 Max aircrafts through August 19, while it waits for Boeing and the Federal Aviation Administration to fix the control systems believed to be the cause of the two recent plane crashes. That means about 115 flights will be cancelled daily leading into their busiest travel season of the year. 

“By extending our cancellations through the summer, we can plan more reliably for the peak travel season and provide confidence to our customers and team members when it comes to their travel plans,” American Airlines President Robert Isom and CEO Doug Parker said in a statement. 

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The planes have been grounded since March when the FAA decided that it needed to investigate “the possibility of a shared cause” between the two crashes. According to the Washington Post, investigators have been able to determine that an automatic anti-stalling feature known as the Maneuvering Characteristics Augmentation System, played a role in both crashes.

“We remain confident that the impending software updates, along with the new training elements Boeing is developing for the MAX, will lead to recertification of the aircraft soon,” Parker and Isom said. 

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Since the fatal crashes, American Airlines has performed over 159 hours of flight testing as well as pilot simulator sessions to ensure the problem has been fixed.

“We’re taking a comprehensive, disciplined approach, and taking the time to make sure we get it right,” said Boeing chief executive Dennis Muilenburg.