United said its Sunday domestic mainline flight punctuality of 77.1% exceeded its record on the same Sunday a year earlier, and it reported that as of mid-afternoon Monday its domestic mainline on-time flight performance stood at 90.6%.

WSJ: Flight Disruptions Ease at United Continental

For instance, InsideTrip awards different scores for the duration of a flight and the airline's on-time performance, its lost-luggage track record, even the amount of legroom aboard planes.

FORBES: Magazine Article

Alaska Airlines landed more than nine out of ten flights on-time in February, according to global flight and airport information service provider FlightStats, which tracks the performance of over 150, 000 flights per day from hundreds of airlines worldwide.

FORBES: Alaska Airlines Leads New List Of Best Performing Airlines