Major U.S. air carriers - late departures 2000-2021

Late departures are strongly seasonal and are affected by weather and heavy demand in winter and summer months. The term Late is defined as 15 minutes after the scheduled departure time. The number of carriers reporting beginning in 2010 is 18. The number of carriers reporting in 2008 and 2009 is 19 (20 through February 2008, after which Aloha Airlines ceased reporting). During 2005 to 2007, 20 air carriers reported on-time performance data, including all major U.S. carriers (carriers with at least one percent of total domestic scheduled-service passenger revenues) and other carriers that reported voluntarily.