Passengers at O'Hare International Airport wait in line to be screened at a Transportation Security Administration (TSA) checkpoint on May 16, 2016 in Chicago, Ill.
Photo by Scott Olson/Getty

TSA apologizes for delays, promises hundreds of new staffers at Chicago O’Hare Airport

The Transportation Security Administration is flooding Chicago’s O’Hare International Airport with more staff and resources after hundreds of passengers were stranded as their planes took off while they waited in line, local and federal authorities said Tuesday.

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TSA Administrator Peter Neffenger apologized at a travel conference Tuesday in Houston to the more than 450 passengers who didn’t make it onto their flights overnight Sunday and Monday as the security screening lines crept along at O’Hare.

“We had a significant challenge in Chicago yesterday,” Neffenger said. “I don’t know what that was, but fixing that, that is of great concern to me.

“I always tell people I won’t apologize for doing our job well, but I do apologize to the people who found themselves stranded in Chicago yesterday,” Neffenger said.

Neffenger and his boss, Homeland Security Jeh Johnson, promised Chicago Mayor Rahm Emanuel on Tuesday that more than 300 extra TSA officers will be assigned to Chicago’s airports by mid-August — 58 of them within the next three weeks.

One hundred more part-time workers in Chicago will be promoted to full time, Emanuel said.

“The TSA wait times at Chicago’s airports have been unacceptable,” Emanuel said. “There is no excuse for passengers to wait in line for hours.”

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Other measures that Emanuel said the feds promised include the tripling of authorized overtime, the addition of at least five more canine teams and the diversion of operational experts to Chicago from airports around the country.

But that wasn’t good enough for Sen. Mark Kirk, R-Illinois.

“The flying public is experiencing a high security risk and economic burden from unnecessary wait times and missed flights due to insufficient staffing at TSA,” Kirk said in a statement Tuesday. “If travelers do not have relief by Memorial Day, TSA Administrator Neffenger must resign and be replaced with a leader who can provide fast and secure screening.”

Even the White House weighed in, as press secretary Josh Earnest acknowledged that Chicago screeners face a “significant challenge.”

“They don’t want to inconvenience people,” Earnest said at the daily White House news briefing. But aviation officials “want to make sure [people] they can engage in travel safety.”

In the meantime, O’Hare advised travelers Tuesday to arrive at the airport three hours early — an hour earlier than the TSA’s standard two-hour guideline.

This story originally appeared on NBCNews.com.

TSA apologizes for delays, promises hundreds of new staffers at Chicago O'Hare Airport