Amsterdam Airport Schiphol
LA International Airport is a hub for American Airlines and also for a number of other smaller airlines. It is a popular airport with tourists visiting the area.
Delta has destinations in Illinois but does not have a hub airport there.
Heathrow, which is also the busiest international airport in the world.
Continental Airlines
Delta
Cape Town, SA is a regional hub of commerce and has South Africa's premier international airport.
Hong Kong International Airport has been operating since 1998 and is the hub for major destinations in China. Cathay Pacific, Hong Kong Airlines and Dragonair are just a few of the airlines calling this airport their home.
United Airlines has five airport hubs in the United States. With the recent United-Continental merger, the Continental hub of George Bush Intercontinental Airport in Houston, Texas, has become the company's largest airport hub (though most of those flights fly under the Continental logo).
CLT is the Charlotte/Douglas International Airport.
The Schiphol Airport is located in Amsterdam. The Schiphol Airport is owned by the Schiphol Group and is a hub for airlines such as KLM, Delta, and Martinair.
Being a hub for US Airways, the fifth largest airline in terms of passengers carried in U.S, then yes it is a big airport.