Airport screeners are calling out sick in increasing numbers, while some workers are fretting about where their next paycheck will come from as a partial U.S. government shutdown enters its third week.

The impact from thinner ranks at the country's airports has had a minimal impact so far, according to the Transportation Security Administration, but the agency warned that travelers may have to wait longer at security lines. Standard wait times are 30 minutes for standard checkpoints, and 10 minutes for TSA's PreCheck.

"We have seen some call outs over the holiday period and they have increased, but are causing minimal impact given there are 51,739 employees supporting the screening process," the TSA told CNBC in a statement. Read More