Gocaps16 From Japan, joined Jan 2000, 4339 posts, RR: 21
Reply 4, posted (11 years 8 months 1 week 3 days 3 hours ago) and read 840 times:
No, there is a walkway from concourse A to B. The only place where you go thru sercurity is at the main terminal...so you can ride on the lounges to concourse C and D from A and dont have to worry about passing thru sercurity. That's what is really neat about IAD.