Delta Air Lines ranks first in a long-running study that ranks U.S. airlines by how often flights arrive on time and other statistical measures.
Researchers from Wichita State University and Embry-Riddle Aeronautical University compared data on rates of on-time arrivals, mishandled baggage, bumping passengers and consumer complaints from 2018 to make their ranking.
The researchers also said that as a whole, U.S. airlines are getting better at handling baggage and overcrowded flights and are getting fewer complaints.
Delta is up from second place last year. JetBlue Airways is second, followed by Southwest Airlines and last year’s winner, Alaska Airlines.
Discount carrier Frontier Airlines ranks last, just behind American Airlines.