United Airlines in January was the most punctual major U.S. carrier, landing 85 percent of flights on time

, according to FlightStats. Just a few hundredths of a percentage point behind, Alaska Airlines placed second, followed by US Airways (82 percent) and American Airlines (80 percent). At 62 percent, Southwest Airlines ranked last among the nine largest U.S. carriers, though FlightStats acknowledged that the airline "disputes the accuracy of this data," which was derived from Federal Aviation Administration arrival figures.