Flight operations in the United States appeared to improve Wednesday, with fewer scheduled cancellations on the sixth day of air travel disruptions, though airlines have warned it would take time for normal services to resume.

More than 810 flights — or 3.5% — were canceled Wednesday by mid-afternoon, according to aviation analytics company Cirium, down from previous days this week. But airlines are still preparing to make further cuts to their schedules under the plan laid out last week by the Trump administration. The 6% reduction in flight traffic that came into effect Tuesday is scheduled to grow to 8% by Thursday and 10% by Friday.

Many carriers said they are working to ensure customers have at least 24 hours’ notice if their flight will be disrupted and have been urging travelers t

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