|A VC-25 over Mount Rushmore.| |Introduction||August 23, 1990
(No. 28000) December 23, 1990 (No. 29000) |Primary user||United
States Air Force| |Unit cost||US$325 million| |Developed
from||Boeing 747-200| The Boeing VC-25 is the designation of a
United States Air Force passenger transportation aircraft, a
military version of the Boeing 747 airliner. The A-model
(VC-25A) is the only variant of the VC-25. The VC-25 is most
famous for its role as Air Force One, the call sign of any U.S.
Air Force aircraft carrying the President of the United States.
The two aircraft currently in U.S. service are highly modified
versions of Boeing's 747-200B, with tail numbers 28000 and
29000. Although the Air Force One designation technically
applies to the aircraft only while the President is aboard, the
term is commonly applied to the VC-25s more generally. They
often operate in conjunction with Marine One helicopters that
ferry the President to airports in circumstances where a vehicle
motorcade would be inappropriate. By 198