American Airlines announced on Sunday it would scrap some 115 flights per day in the coming months because its fleet of Boeing 737 MAX planes is being grounded until August 19.
Carriers that have used the aircraft since it went into service two years ago have had to rethink their flight plans since alarms were raised over its safety in the wake of two fatal crashes.
Senior officials at American Airlines said they were "confident" that the Boeing upgrade would be approved by USA aviation regulators before 19 August, despite its decision to ground its fleet of 24 planes until then.
Boeing 737 Max 8 and 9 jets have been grounded in the United States since March 13, when the FAA concluded that it needed to investigate "the possibility of a shared cause" between the two crashes.
Southwest Airlines, the largest operator of Boeing jets, announced last week that it would be cancelling its MAX flights until August 5.
The airline's CEO Doug Parker and President Robert Isom issued a statement saying it would cancel 115 flights daily through August 19, representing approximately 1.5 of the airlines' flying each day during the summer.
The airline says its reservations and sales teams will work with customers to manage their travel plans.
The airline said it will bring the Max aircraft back on line as spares to supplement its operations once it is receritfied. The airline said about 115 flights per day would be canceled.
American also said on its website that customers could request a full refund if they chose not to be rebooked.
American cancelled 350 flights out of Dallas-Fort Worth on Saturday, but that had nothing to do with the MAX, said spokesman Ross Feinsten.
"My team and I are working closely with our customers to answer their questions, get their feedback and ensure those who operate the Max are prepared when the grounding is lifted and the fleet returns to flight", Muilenburg said.
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