The largest U.S. airlines had an on-time arrival rate of 80.3 percent in August, an improvement from 77.7 percent in August 2014,

the U.S. Department of Transportation reported. Carriers canceled 1 percent of scheduled domestic flights and reported only two tarmac delays greater than three hours on domestic flights. Delta Air Lines (85.5 percent) and Alaska Airlines (82.9 percent) had the highest percentages of on-time arrivals, as well as the lowest rates of canceled flights. Spirit Airlines (63.7 percent) and JetBlue Airways (74 percent) had the lowest on-time arrival performances.