A flurry of flight cancellations began Friday morning after the Trump administration ordered airlines to reduce operations amid staffing shortages inflamed by the record-long government shutdown.

The Federal Aviation Administration on Thursday shared a list of 40 major U.S. airports that will reduce flights by 4 percent. By the end of next week, that number could increase to 10 percent if the lapse drags on, according to the administration.

Air traffic controllers have continued to work without pay for weeks, raising concerns for lawmakers and aviation regulators alike as morale starts to fade. Some have........

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