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51 stands for the model of the Plane. The P stands for the series of planes example: P-40

P-47

P-38

P-51

The number i dentifies the specific plane. Planes are also updated or improved, so they put in letters example: P-51 B, P-51 D, P-51 H, ect.

I believe the P in P-51 stand for "Pursuit" such as B in B-25 stands for Bomber.

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11y ago

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