Last updated: 11:50 a.m. ET. Next update: 4 o’clock ET.

Airline passengers were subjected to delays and cancellations of Midwest on Sunday, one of the busiest travel days of the year, as many holiday travelers get home from Thanksgiving.

Nationally, nearly 500 flights have been canceled and another 700 delayed at. 11:50 ET ET, according to flight-tracking service FlightAware.

Most of them came to the Midwest, where a winter storm brings snow, ice and rain to a loop in Great Plains and Midwest. Blizzard terms were possible Sunday over parts of Iowa, Illinois, Missouri and Wisconsin.

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The weather has resulted in flight cancellation at a number of airports in the region, including Kansas City, Missouri; Omaha, Nebraska; and Des Moines and Cedar Rapids, Iowa.

But the biggest impact on air travelers was in Chicago, where more than 200 combined arrivals and departures had been canceled at 1

1:50 ET at the city’s busy airport.

Hare is an important hub for both United and American, and many of the cancellations were there on affiliate airlines flying regional flights under US and US trademarks. On behalf of FlightAware. The cancellations accounted for more than 7 percent of Sunday’s entire schedule on O & Hare. About 100 of the Hares cancellations were made prior to Saturday night, when storm forecasts were strengthened.

Cancellations also sprung up Sunday morning over the city at Chicago Midway Airport, an important base for Southwest Airlines. Combined 122 arrivals and departures – about 15 percent of the whole day’s schedule there – had been canceled there at 11:50 a.m.

Many major airlines resigned from change charges.

The details vary depending on the operator, but generally allow exempted customers to make a change to their travel plans without paying change charges that cost $ 200 or more.

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