One of the main MUPs in our area goes up to and around Baltimore Washington International airport. I've circled the airport before (on my bike, that is. Although I guess I've also circled the airport in my car and on a plane.) but haven't followed the path that goes up to the terminal. I don't know if it goes all the way--the map makes it look like it stops just short of the terminal.

I don't know about bike parking, but if they don't have it in the garages, there's a commuter train station and light rail station at the airport too, and they usually have bike parking.

If you're not coming in on one of the bike paths (main one from Annapolis, but the Baltimore bike trail map gives routes from downtown as well), it's a trick to get to the airport by bike because there are so many interstates in the way. It's doable, but you have to have a good map or know the area well.

Sarah