Major airlines are those with an average of 100 or seats or more on regularly scheduled flights flown during June 2009. Regional carriers are those with less than 100 that are certified exclusively as Chapter 121 carriers (and fly only scheduled flights with 10 seats or more). Flights are counted by total segments flown, so a flight from New York to Los Angeles with a layover in Denver would be counted as two departures.

Follow the airline links for crash reports and other incidents, traffic data, "doing business as" records and employee counts. Click on a column header to sort the list; click a second time to reverse the sort order.