Baltimore/Washington International Thurgood Marshall Airport
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Location: Baltimore, Maryland
Airport Code: BWI
Located south of Baltimore, BWI is often used as an alternate airport for travelers visiting Washington, D.C. which is only one hour (without traffic). BWI is a major East Coast hub for Southwest Airlines.
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Dulles International Airport
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Location: Washington, D.C.
Airport Code: IAD
Located in northern Virginia, Dulles is the main international airport for Washington, D.C. while the capital's primary domestic airport is Washington Reagan National Airport. United Airlines frequently operates out of Dulles.