“We will never compromise on safety. When staffing constraints arise, the FAA will slow down air traffic at impacted airports to ensure operations remain safe,” FAA spokesperson Hannah Walden tells WIRED, adding that Transportation secretary Sean Duffy “said that air traffic controllers who report to work will be paid. Regarding reductions in force (RIFs), DOT has been clear for months: safety critical positions—including air traffic controllers—have and will continue to be exempt from any RIFs.”

In a written statement, a spokesperson for the TSA said of employees working without pay: “It’s unfortunate they have been put in this position due to political gamesmanship. Our hope is that Democrats will soon recognize the importance of opening the government.”

On Thursday, Duffy suggested on Fox Business News that controllers and other workers who don’t come to work during the shutdown would be fired. “If we have a continual small subset of controllers that don’t show up to work, and they’re the problem children … if we have some on our staff that aren’t dedicated like we need, we’re going to let them go,” said Duffy.

One air traffic controller described this week’s working conditions as “pretty much the same” but with “an undercurrent of fear that the dipshits in charge will use this as an excuse to decertify our union and take away all bargaining rights.”

Air traffic workers know that accusations of coordinated activity and sick-outs, or informal labor actions that could violate long-standing bargaining agreements with the government, are especially perilous right now, as federal officials threaten the status of public sector unions. The Trump administration suddenly ended TSA workers’ collective bargaining agreement in March, before a court preliminarily halted the move in June. Workers worry that taking an absence, even when it’s needed, could have long-term consequences for their union—and therefore, their working conditions.

The National Air Traffic Controllers Association did not respond to WIRED’s request for comment. But a pop-up on the public union’s website notes that it “does not endorse, support, or condone any federal employees participating in or endorsing a coordinated activity that negatively affects the capacity” of the National Airspace System.

Jones, the TSA agent and union leader, says his group won’t organize sick-outs. But employees may have to call out if the lack of pay means “they don’t have the means to commute into work,” he says.

“We are sick and tired of being political pawns for Washington,” adds Jones.