WASHINGTON —

As the federal government entered the second week of a shutdown, staffing shortages among air traffic controllers began impacting travel .

But even before the shutdown began on Oct. 1, a shortage of air traffic controllers existed. Advertisement

More than 13,000 air traffic controllers were set to continue working during the shutdown without pay, according to the Department of Transportation’s contingency plan . Other activities that will continue include the hiring and field training of controllers.

"You've seen the delays around the country. You've seen us warn for over a decade that if we do not do something and there's not an investment, there's going to be additional delays," Nick Daniels, president of the National Air Traffic Controllers Association , told

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