Air travel disruptions are continuing on Wednesday, and even though lawmakers are in Washington to vote on a deal that may end the government shutdown , officials warned that delays and cancellations may persist.

Nearly 700 flights were set to be canceled on Wednesday, according to data from the aviation analytics firm Cirium. Flight cuts are set to ramp up again on Thursday, meaning 8% of scheduled flights at the nation's 40 busiest airports will be canceled. Secretary of Transportation Sean Duffy warned that the impacts might become more serious if the deal to reopen the government does not pass.

"If this doesn't open, you might have airlines that say 'We're going to ground our planes. We're not going to fly anymore,'" Duffy warned on Tuesday night. "That's how serious this is."

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