Construction projects are planned around short weather windows, meaning that any delays in the planning and regulation phase could upend the entire schedule. Any minor changes to current projects under construction that need FAA approval can cause issues as well. The U.S. Travel Association estimates a cost of $1 billion each week on America’s travel economy. Meanwhile, President Trump is threatening to permanently fire hundreds of federal workers and cut more programs supported by Democrats. The last shutdown, in 2018 during the first Trump administration, was also the longest in U.S. history, lasting 35 days.