An airline hub, or hub airport, is a city or airport where an airline has a heavier presence, usually in cities that also feature the airline’s headquarters, administrative offices, or acts as a regional gateway city. If an airline has a large presence in a city that is not home to offices, it is usually referred to as a focus city or a secondary hub.
Airlines that have their hub in a particular location usually offer some of the most competitive pricing on flights, either inbound or outbound. jetBlue has its HQ in Queens, New York, and has its primary airline hub nearby at JFK. When flying with jetBlue, you will notice that most of their special offers relate somewhat to JFK. Another example is Delta, which has their HQ and primary hub at Atlanta’s Hartsfield-Jackson International Airport (ATL), and likewise offers great rates on destinations to and from ATL.
The airline hub is the central part of the “hub and spoke model.”