On Friday over 800,000 federal workers experienced their first day without pay as a result of the government shutdown.
Screeners start around $24,000 a year, and most earn between $26,000 and $35,000, according to TSA.
Employees with the Transportation Security Administration (TSA) walk through Reagan National Airport in Washington.
Flights that would otherwise depart from Terminal G in the afternoons will use gates in other parts of the airport.
Chin said Terminal G will close at 1 p.m. Saturday, reopen for flights Sunday morning and close again at 1 p.m. that day.
The lawsuit is at least the third filed by a union on behalf of federal employees who have not been paid during the shutdown, which began December 22.
"The loss of officers, while we're already shorthanded, will create a massive security risk for American travelers since we don't have enough trainees in the pipeline or the ability to process new hires". 'They're erring on the side of caution'.
A United spokesperson told the Herald that they did not predict its passengers would experience flight delays due to the temporary terminal closure as the airline 'will work to ensure we do everything we can for our customers'. He declined to say how many inspectors are working, but union officials believe it's about 100.
The shutdown is already affecting some airport operations, though no problems have been reported yet in Chicago.
Lines at the nation's airports have been normal, Bilello said.
TSA has downplayed reports that a rise in airport screeners calling out sick - or even quitting their jobs - has led to long lines at security.
In a wave of what one federal official has dubbed as the "blue flu" - a nod to the blue shirts worn by TSA officers - hundreds of TSA screeners at at least four major airports have called out from their shifts since the shutdown began in December.
Chicago's Aviation Department is talking with the TSA and is ready with contingency plans if they are needed, spokeswoman Lauren Huffman said.
Across the country, protesters rallied for the 420,000 employees who are working without pay - and the 380,000 who are simply out of work.
Seattle-Tacoma International Airport organized a resource fair to bring together credit unions, utility representatives and nonprofit organizations to help federal employees access short term loans and assistance programs, said spokesman Perry Cooper.