The airline announced cancellations for Friday, Saturday, and Sunday to comply with the FAA-mandated flight reductions.

United said that anyone who is traveling during the flight reduction period will be eligible for a refund, even if their flights are not impacted.

Overall, United has canceled more than 100 flights each day, from Friday, Nov. 7 through Sunday, Nov. 9, the airline's website showed. Of those, 34 United flights scheduled to depart or arrive at Chicago O'Hare International Airport Friday were cut, with that number increasing to 38 Saturday.

As the U.S. government shutdown enters its 37th day ( making it the longest in American history ), the Federal Aviation Administration ( FAA) has ordered the cancellation of 10 percent of flights at 40 major airports in the U.S.

FAA orders schedule reductions at 40 domestic airports starting Friday due to the government shutdown, prompting United Airlines to offer customer refunds.

According to the FAA, thousands of flights at "high-traffic" airports across the country will be cut or canceled starting Friday. The decision, the FAA and U.S. Transportation Secretary Sean Duffy said, was based on where air traffic controllers are feeling the most pressure.

The reductions to flight capacity are the government shutdown’s latest effect on the airline industry, which has dealt with staffing troubles and high wait times in recent weeks.

United Airlines is the largest carrier at Newark Liberty International Airport - how will it cope with the FAA's planned 10% flight reduction that begins this Friday?

United Airlines CEO Scott Kirby said the refund offer was available to any travelers who did not want to fly amidst newly announced restrictions.