The Federal Aviation Administration on Friday halved the number of flights that U.S. airlines must cut from their schedules at 40 airports as the country’s aviation system recovers from a shortage of air traffic controllers during the record government shutdown.

The agency said airlines will only have to cancel 3% of their flights beginning at 6 a.m. Saturday instead of 6%. Citing safety concerns, the FAA first ordered flights reduced at the busy airports on Nov. 7 as absences mounted at air traffic facilities and airport towers. Controllers were among the federal employees who were required to work while going unpaid during the shutdown.

The number of cancellations peaked last Sunday at nearly 3,000 flights, about 10% of the ones scheduled, as a result of the FAA order combined with con

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