Air Transportation

Air transportation (NAICS 481) covers scheduled and charter passenger airlines, air cargo carriers, and air taxi operators. Four carriers dominate US domestic passenger aviation: American Airlines, Delta Air Lines, United Airlines, and Southwest Airlines collectively control approximately 80% of domestic seat capacity. Delta and United operate global hub-and-spoke networks from Atlanta (ATL), Chicago (ORD), and Houston (IAH), while Southwest pioneered the low-cost point-to-point model from its Dallas Love Field (DAL) base.

The Federal Aviation Administration (FAA) regulates aircraft certification, pilot licensing, maintenance standards, and air traffic control. The Department of Transportation (DOT) oversees route authority, consumer protection, and airline economic fitness. International routes require bilateral Open Skies agreements, with the US maintaining such treaties with over 130 countries. The Airline Deregulation Act of 1978 eliminated federal control over domestic fares and routes, enabling the competitive dynamics that produced today's consolidated industry structure through successive waves of mergers including Delta-Northwest (2008), United-Continental (2010), and American-US Airways (2013).

Air cargo operates as both a byproduct of passenger networks (belly freight) and through dedicated freighter operators. FedEx Express, based in Memphis (MEM), and UPS Airlines, based in Louisville (SDF), operate the two largest dedicated cargo fleets. Amazon Air has built a fleet of over 90 aircraft operating from its Cincinnati/Northern Kentucky (CVG) hub. E-commerce growth has sustained air cargo demand even as international belly freight capacity recovered post-pandemic.