As a government shutdown looms, U.S. airlines and aviation groups have issued warnings about the potential disruptions to travel. Travelers should prepare for possible delays and cancellations, particularly regarding flights, as a government funding lapse may halt air traffic controller hiring and slow down essential safety inspections. The shutdown could affect not only air travel but also operations at major airports and national parks. With airlines estimating a potential loss of $1 billion weekly in the travel sector, travelers are advised to stay informed about the implications for their flights, TSA wait times, and overall travel plans.