just be sure you take the right path... if you dont you will undoubtedly miss your connection. the queue for people entering IAD as their final destination is extremely long. Last time i flew lhr-pek via IAD we were late and we had to ask people to let us thru as they were waiting for us. As the queue is short on the transit path, people were very obliging and let us thru happily. We ran all the way to the deserted gate where a csr nonchalantly said, you guys must be the pair from london...we boarded and they closed the doors...good service..