We often get questions here about how to get to or from our three major airports; Washington (Reagan) National (DCA); Dulles International (IAD) and Baltimore Washington International (Marshall) (BWI) Airports.
The Washington Post today updated the latest information using public and/or private transportation to and from the various area airports. This is quite useful and always a topic of interest on these boards! Please see the link below for more information.
I hope this is helpful.