Air traffic controllers will get most of their pay within two days after the federal government reopens, but traffic restrictions at the nation’s busiest airports could continue, U.S. Transportation Secretary Sean Duffy said Tuesday.

Duffy spoke at O’Hare Airport, which led the nation in flight cancellations over the weekend as the season’s first major winter storm compounded government-mandated airspace restrictions .

The Federal Aviation Administration’s air traffic cuts took effect Friday , with airlines initially canceling 4% of flights. Cancellations were expected to scale up to 10% by this Friday.

As of 4 p.m. Tuesday, 121 flights at O’Hare were canceled, the second most in the country after New York’s LaGuardia Airport, according to FlightAware.

Duffy’s announcement comes after

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