The impacts of the longest federal government shutdown in United States history are reverberating around the country — leaving millions of Americans in limbo and igniting concerns about an economic downturn.

Frustrated travelers were scrambling as more than a thousand flights were canceled Friday and thousands more were delayed. Those who count on food stamps were in limbo as President Donald Trump’s administration continued fighting in federal court to resist paying full benefits for November. Federal workers who haven’t been paid in weeks said their bills were due and they were running out of options.

With Congress in a stalemate — majority Republicans still short of the 60 votes they need to pass a government funding measure in the Senate, and minority Democrats sticking to their health insurance funding demands — no end to the shutdown is in sight.

Senate Majority Leader John Thune, a South Dakota Republican, told reporters Friday that the “wheels came off” in compromise talks with Democrats. He told senators to remain in Washington and available for votes this weekend. Senate Minority Leader Chuck Schumer said Democrats would agree to end the shutdown in exchange for one more year of enhanced Affordable Care Act subsidies — an attempt to further pressure the GOP to make a deal.

The uncertainty over when the shutdown might end has led to deepening concerns about damage it could do to the overall