WASHINGTON – Airlines, led by low-cost carrier AirTran Airways, are doing a better job of getting passengers to their destinations on time, with their bags, and with fewer complaints, private researchers who have analyzed federal data on airline performance said Monday.

It was the second year in a row that AirTran topped the rankings of the nation's 15 largest airlines included in the annual report. Hawaiian Airlines and JetBlue Airways also repeated their performance from the previous year, ranking second and third, respectively.

The rankings are based on data airlines supply the Department of Transportation regarding lost bags, delayed flights, and bumpings from full planes, and consumer complaints made to the department.