The concourses at Dulles are not yet all connected by walkways and trains. So these mobile lounges move you from concourse to concouse.
Washington Dulles International Airport, VA
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Linked from Paleo-Future ("Jetscalator (1960)" - November 12, 2008) at www.paleofuture.com/2008/11/jetscalator-1960.html
Blogged by Cardinal Peak's Blog ("Mobile Lounges and Development Methodology" by Howdy Pierce - October 23, 2009) at www.cardinalpeak.com/blog/?p=234
Blogged by We Love DC ("Talkin’ Transit: The Longest Walk" by Samer Farha - April 6, 2011) at www.welovedc.com/2011/04/06/talkin-transit-the-longest-walk/