Travelers around the United States faced delays at major airports during the busy holiday weekend, as winter weather disrupted airlines' schedules and software issues temporarily grounded a popular plane model in the days after Thanksgiving.

There 1,815 inbound and outbound flight delays reported across the U.S. on Sunday morning, according to the tracking site FlightAware . The tracker also showed 490 flight cancellations. Airports in Chicago, New York City, Boston, Des Moines, Minneapolis and Detroit were among those most affected.

A powerful snowstorm in the Midwest and Great Lakes regions initially interrupted air travel for some in the wake of last week's holiday. National Weather service offices issued a flurry of winter storm warnings and advisories from Montana to Ohio as a

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