Some airlines may use only a single hub, while other airlines use multiple hubs. Hubs are used for both Passenger flights as well as Cargo flights.
Many airlines also utilize Focus Cities , which function much the same as hubs, but with fewer flights. Airlines may also use hubs, a non-technical term for large focus cities. Examples include British Airways at Manchester International Airport and US Airways at Pittsburgh International Airport .
Some of the major airlines' most significant hubs are known as hubs; such airports are typically dominated by a single airline, which can fly upwards of 70% of a fortress hub airport's traffic. Examples include is often cited as an example. Northwest was able to outcompete the short-lived discount carrier by matching its fares and offering more frequent flights.
- Aeroméxico (AM) uses Benito Juárez International Airport (MEX), General Mariano Escobedo International Airport (MTY), and Hermosillo International Airport (HMO).
- Air Canada (AC) uses Toronto Pearson International Airport (YYZ), Vancouver International Airport (YVR), and Montréal-Pierre Elliott Trudeau International Airport (YUL) (and to a lesser extent Calgary International Airport (YYC)).
- Alaska Airlines (AS) uses Seattle-Tacoma International Airport (SEA), Portland International Airport (PDX), and Ted Stevens Anchorage International Airport (ANC) (and to a lesser extent Los Angeles International Airport (LAX)).
- American Airlines (AA) uses Dallas-Fort Worth International Airport (DFW), O'Hare International Airport (ORD), Lambert-Saint Louis International Airport (STL), Miami International Airport (MIA) and Luis Munoz Marin International Airport (SJU) (and to a lesser extent John F. Kennedy International Airport (JFK), Los Angeles International Airport (LAX), Logan International Airport (BOS), and La Guardia Airport (LGA)).
- Continental Airlines (CO) uses Newark Liberty International Airport (EWR), George Bush Intercontinental Airport (IAH) and Hopkins International Airport (CLE). Continental Micronesia , a subsidiary, uses Guam's Antonio B. Won Pat International Airport (GUM).
- Delta Air Lines (DL) uses Hartsfield-Jackson Atlanta International Airport (ATL) (said to be the world's largest hub), Cincinnati-Northern Kentucky International Airport (CVG), Salt Lake City International Airport (SLC), and John F. Kennedy International Airport (JFK). Delta Shuttle runs between Logan International Airport (BOS), La Guardia Airport (LGA), and Reagan National Airport (DCA).
- JetBlue Airways (B6), a Low-fare Airline , mostly runs point-to-point service, but has hub-like operations in John F. Kennedy International Airport (JFK) and Logan International Airport (BOS).
- Mexicana (MX) uses Benito Juárez International Airport (MEX) and Don Miguel Hidalgo Y Costilla International Airport (GDL).
- Midwest Airlines (YX) uses General Mitchell International Airport (MKE) and Kansas City International Airport (MCI).
- Northwest Airlines (NW) uses Minneapolis-Saint Paul International Airport (MSP), Detroit Metropolitan Wayne County Airport (DTW), Memphis International Airport (MEM) and Tokyo's Narita International Airport (NRT).
- United Airlines (UA) uses O'Hare International Airport (ORD), San Francisco International Airport (SFO), Washington Dulles International Airport (IAD), Denver International Airport (DEN), Los Angeles International Airport (LAX), and Tokyo's Narita International Airport (NRT).
- US Airways (US) uses Charlotte Douglas International Airport (CLT), Philadelphia International Airport (PHL), and Phoenix Sky Harbor International Airport (PHX). Pittsburgh International Airport (PIT) used to serve as a hub, but it has since been downgraded to a Focus City /secondary hub. Las Vegas's McCarran International Airport (LAS) is a secondary hub. Fort Lauderdale-Hollywood International Airport is also a focus city. US Airways Shuttle runs between Boston's Logan International Airport (BOS), New York City's La Guardia Airport (LGA), and Washington, D.C.'s Reagan National Airport (DCA), all of which are considered by the airline to be focus cities. PHX and LAS were inherited from the airline's merger with America West Airlines .
- ---Source: City of Charlotte & Mecklenburg County, May 2005; USAirways.com, June 2005
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