Gocaps16 From Japan, joined Jan 2000, 4329 posts, RR: 22
Reply 4, posted (11 years 2 months 3 weeks 1 day 10 hours ago) and read 805 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.