Air traffic controllers at Philadelphia International Airport said they're continuing to work long hours without pay as the federal government shutdown enters its fourth week.

On Tuesday, controllers received their first zero-dollar paychecks .

Charles Jaques, an air traffic controller who said he spends six days a week in the tower, said he and his colleagues are still trying to keep passengers safe under growing financial strain.

"The air traffic controllers that are working the flights in and out of here on a daily basis are currently doing it without getting a paycheck," Jaques said. "I just worked 80 hours last week, and I received zero dollars in compensation."

Jaques showed CBS News Philadelphia his empty paycheck for the pay period between Oct. 5 and Oct. 18. He said it's t

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