Airlines rushed to provide travelers updates after the Federal Aviation Administration said Wednesday that it would reduce flights across 40 airports as the longest government shutdown in history continues to drag on.

Many major airlines said they would waive cancellation fees for even their most basic tickets, which often come with penalties for changes.

Transportation Secretary Sean Duffy previously said he would reduce flight capacity by roughly 10%, affecting 3,500 to 4,000 flights daily.

The FAA has not yet announced which "high traffic" airports would be affected.

These are the airports that are expected to be impacted, based on preliminary information before the agency meets with airlines to finalize cuts, CNBC's Phil LeBeau reported. The preliminary list includes some of

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