Anxious travelers across the U.S. felt a bit of relief Friday as airlines mostly stayed on schedule while gradually cutting hundreds of daily flights because of the government shutdown .

Plenty of nervousness remained, though, as more canceled flights are expected in the coming days to comply with the Federal Aviation Administration’s order to reduce service at the busiest airports.

While the FAA order left some passengers making backup plans and reserving rental cars, the more than 800 routes scratched Friday represented just a small portion of the overall flights nationwide.

Passengers still faced last-minute cancellations and long security lines at the 40 airports targeted by the slowdown including major hubs in Atlanta, Dallas, Denver, and Charlotte, North Carolina.

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