(NBC CHICAGO) - Chicago's O'Hare and Midway Airports are among 40 high-traffic markets that will see thousands of flights cut starting Friday, a report from NBC News said, as the Federal Aviation Administration works to maintain air travel safety amid the longest government shutdown in history , which now stretches into its 37th day.

The measure come days after U.S. Transportation Secretary Sean Duffy warned of "mass chaos, cancellations and flight delays" if lawmakers allow the shutdown to continue.

The cuts amount to a 10% reduction in flights at 40 airports across the country, Duffy said Wednesday during a press conference with Federal Aviation Administrator Bryan Bedford. Bedford and Duffy said the decision about which airports are impacted was based on where air traffic contr

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