Gocaps16 From Japan, joined Jan 2000, 4335 posts, RR: 21
Reply 4, posted (11 years 4 months 4 days 7 hours ago) and read 813 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.