Air travel disruptions continued Thursday as officials warned that cancellations and delays could persist even after the end of the government shutdown . More than 990 U.S. flights were canceled as of 9 a.m. ET, according to the tracking site FlightAware .

The Department of Transportation on Wednesday night announced that 6% of scheduled flights at 40 of the nation's busiest airports will remain canceled on Thursday, rolling back the initial plan to increase cancellations to 8% on Thursday.

"I think we'll be back a lot faster than people think," Delta CEO Ed Bastian said in an interview Thursday on "CBS Mornings," noting that the last few days have already started getting better.

"As soon as the Senate deal on Monday got approved, staffing levels almost overnight improved d

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