Mobile Lounges @ Airports

Hi folks,

this weekend I was reading a report about the Washington Dulles International Airport (IAD/KIAD) in the german commercial aviation magazine Aero International.

On a page I saw a “Mobile Lounge”, first used in the USA, reduse apron congestion by coveying passengers to aircraft parked away from the terminal buildings on a jet ramp. Their extensible and swivelling gangways scissors-lift to enclouse to any aircraft door or terminal gate -and so protect up to 150 passengers from noise and weather. They travel at speeds up to 20mph.
Today, Dulles operates 19 mobile lounges.
Sources: The Flier’s Handbook – Pan Books 1978 and History of Washington Dulles International Airport

So my questions are:
1. Which other airports in the world operate mobile lounges?
2. Which type and how much of them do they operate?
3. Have you got a info or links, where i can gain more infomation and pic’s?
4. Are mobile lounges old-fashioned, or do they still have a future at large airports?

To question #1.:
While writing ths post, I remember, that in 1992, I flew with my father to Paris – Charles De Gaulle Airport (CDG/LFPG). We also used there a mobile lounges to travel from jet to terminal.

Thanks in advance!