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United said Friday that without the planes, it will cancel 56 flights a day in January, February and early March, down from 93 a day this month.
United has 14 Max jets. All Max planes have been grounded since March, after crashes in Indonesia and Ethiopia killed 346 people.
Boeing is fixing flight-control software and computers that played a role in the crashes. Boeing expects regulators to approve changes in pilot training in January, clearing the way for U.S. airlines to resume Max flights with passengers.