L.1011 From United States of America, joined Aug 2001, 2209 posts, RR: 9
Reply 2, posted (10 years 7 months 3 weeks 5 days 15 hours ago) and read 3165 times:
The official US Government designation is Boeing VC-25. V=VIP C=Cargo literally, but truly means transport. -25 just means that is the 25th VIP design submitted, but not nessecarily entered into service. For example, there was an F-17. There will never be another F-17, after that one lost to the F-18, and all following fighter designations will count the F-17 as a design.