What is the name of Washington DC's airport?

Ronald Regan National Airport (used to be called National) is just across the Potomac from DC. It is also on the metro line so it is easy to get to. Airport code is DCA

Dullas International Airport (normally called Dullas) is about 30-45 minutes from DC in Northern Virginia. Airport code is IAD

Baltimore Washington International Airport is north of DC towards Baltimore. It is about 45-60 minutes north of DC and you can get there off 95 North or via Amtrak or train. Airport code is BWI.

Metropolitan Airport authority manages IAD and DCA