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...the Transportation Security Administration plans to hire nearly 800 new officers this month and pay for more part-time workers and overtime.

But the union that represents security officers said that won't solve the problem, and that TSA needs 6,000 additional full-time officers to address a shortfall that has come as airlines are experiencing an increase in passengers.

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About 450 American Airlines customers at O'Hare International Airport missed flights Sunday due to lines of more than two hours, and dozens who couldn't get on a later flight slept on cots at the terminal, American spokeswoman Leslie Scott said.

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Chicago aviation department spokesman Owen Kilmer said the TSA budgeted for 15 canine units at the two Chicago airports, which can cut wait times because dogs can sniff passengers for explosive materials, allowing them to be moved to a quicker line.

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