@Holden:
1/700 gives the junkers Ju 52 a 1.6 inch wingspan. Slightly larger than the standard Axis & Allies airplane scale (the A&A bomber has a wingspan of 1.5 inches).
If you assume the A&A bomber is a B-17, then the miniature scale is:
Real life B17 wingspan = 103 ft 9 in = 1245 in
A&A plastic bomber piece wingspan = 1.5 in
1245 in / 1.5 in = 830
Therefore, the A&A aircraft scale is 1/830.
1/700 is fairly close.
The measurements you made are incorrect. Therefore, so are your calculations.
B17 wingspan = 31.62m
A&A B17 wingspan = 47mm
31.62/.047 = 672
A&A B17 aircraft scale is 1/672
Furthermore, the scales on the A&A pieces are inconsistent. They vary from piece to piece.