Gocaps16 From Japan, joined Jan 2000, 4398 posts, RR: 18
Reply 4, posted (12 years 9 months 3 weeks 1 day 21 hours ago) and read 1011 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.