VC-25A's, why not the 747-400 airframe ?

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Quote: ....The first VC-25A -- tail number 28000 -- flew as "Air Force One" on Sept. 6, 1990, when it transported President George Bush to Kansas, Florida and back
to Washington, D.C. A second VC-25A, tail number 29000 transported President
Bill Clinton and former Presidents Carter and Bush to Israel for the funeral
of Prime Minister Yitzhak Rabin.

Introduction Date Dec. 8, 1990 (tail No. 28000); Dec. 23, 1990 (tail
No. 29000)
Date Deployed Sept. 6, 1990 (tail No. 28000); Mar. 26, 1991 (tail No.
29000)

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I was always curious as to why the basic 747-200 airframe was chosen for the two VC-25A's and not the updated with the newer 747-400 airframe considering that both VC-25A's flew for the first time in 1990 while the very first 747-400 made its maiden flight a year or two before and put into commercial service with PW4000 engines by Northwest Airlines.

The 747-400 airframe already existed, so why not using this airframe for both VC-25A's ?

In any case, why isn't both VC-25A's retrofitted with -400 winglets either to make it the only 747-400 passenger transport that has the shorthened -200 upperdeck which is only found on the -400 freighter ?

Any clue(s) ?




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