A survey by travel eSIM provider Holafly has identified the speediest airports in the US to test the 'airport theory' trend, which involves people showing up late to clear security. The theory suggests that passengers can make it to their gate faster than others without wasting time. The study compared factors such as passenger volume, on-time rates, typical TSA wait times, and airport size. Salt Lake City International Airport (SLC) was named the No. 1 airport to test this theory, with an on-etime rate of 82.75 and a typical TSA waiting time of 15 minutes. Other top five included Washington Dulles International (IAD), and Baltimore/Washington International Thurgood Marshall (BWI).