Already, Atlanta's airport – the busiest in the world – publicly called out the agency last month for persistently long lines that it blamed primarily on staffing levels.

Now, some of the nation's other top airports are joining the fray.

Seattle-Tacoma International Airport became one of the latest. The airport warned fliers on Wednesday via Twitter they should "expect longer wait times" because TSA "staffing (is) not keeping pace (with) passenger volumes." Seattle added a hashtag saying "#PackYourPatience."

@AskTSA staffing not keeping pace w/ passenger volumes. Expect longer wait times & #PackYourPatience. pic.twitter.com/zoKInTWV4M

— Sea-Tac Airport (@SeaTacAirport) March 9, 2016