A mobile lounge is a system for boarding and disembarking from aircraft using a bus-like vehicle. Purpose The mobile lounge was an innovative feature of the Washington Dulles terminal design by Eero Saarinen. Saarinen promoted the mobile lounge concept with a short animated film by Charles and Ray Eames. Dulles Airport was the realization of the concepts expressed in the film. Dulles's designers thought that by shuttling from the main terminal directly to a midfield jet ramp, they could save passengers from long walking distances amidst weather, noise, and fumes on the ramp. The advent of the jet bridge and construction of the two midfield concourse buildings at this airport negated the benefits of the system. Application The mobile lounge is used at Washington Dulles International Airport in the U.S. state of Virginia and at Montréal-Trudeau International Airport in the Canadian province of Quebec. The system was also previously used at Montreal Mirabel International Airport, John F. Kennedy International Airport's International Terminal in New York City, Mexico City Airport until 2007, Charles de Gaulle Airport in Paris and at King Abdulaziz International Airport in Jeddah, Saudi Arabia until the early 2000s. While it is still used at Dulles Airport, the growth in passenger numbers and aircraft capacity made it impractical to use mobile lounges for individual flights. Remote concourses were constructed, and the fleet of mobile lounges was used as a shuttle between the concourses and the main terminal. On January 26, 2010, the Metropolitan Washington Airports Authority replaced the Dulles mobile lounge system for passenger movements between the Main Terminal and the A-, B-, and C-Gates with the underground AeroTrain. However, some mobile lounges and plane mates remain in use for passenger movements between the main terminal and Concourse D (until the replacement Concourses C and D are built and the AeroTrain is built out to run in a continuous two-way loop), to disembark international passengers from all arriving international aircraft (with the exception of United Airlines and certain Star Alliance flights, which are directly serviced at Concourse C's Federal Inspection Station; and flights from airports with border preclearance) and carry them to the International Arrivals Building, and to convey passengers between the main terminal and aircraft on hard stands (i.e., those parked remotely on the tarmac without access to jet bridges). PTVs are still in use at the Philadelphia International Airport at Terminals A-East and A-West. The PTVs