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There were 12,731 B-17s built. According to Ray Wagoner's "American Combat Planes," we lost 4,688 of them, or 36.8%. So, the loss rates were close as you say.
We built 18482 B-24s and lost 3626. or 19.6%. Combined the rate is 26.6%.
If you add the B-29, the combined loss rate for our heavy / super heavy is 24.8%.
This all smells like A-0 albeit with incorrect numbering (missing leading zero, correct would be A-05, A-020, etc)Also reported as lost are 32 other types including an A-02, -03, A-4, A-5, A-6, A-7, A-8, A-9, A-10, A-11,A-12, A-13, A-14, A-15, A-16, A-17, A-18, A-19, and A-20 all with 1 loss each,