Another Government Shutdown? Here’s What Travelers Should Know.

The Department of Homeland Security is set to run out of money at midnight, leaving parts of the agency unfunded. Congress has funded the rest of the federal government through the end of the fiscal year, but Democrats have blocked money for D.H.S. and vowed to oppose any spending bill that does not include new restrictions on immigration agents.

Employees of the Transportation Security Administration, which is part of D.H.S., must again work without pay beginning on Saturday, though it was not immediately clear whether travelers this weekend would face delays at airport security checkpoints. In past shutdowns, disruptions were scattered at first but grew as the funding lapse dragged on; air traffic controllers will not be directly affected this time because lawmakers have already funded the Department of Transportation.

A D.H.S. contingency plan says about 95 percent of the T.S.A.’s 64,000 employees must continue showing up to work.

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