
There was no designation for British aircraft (i.e. P for Pursuit, C for
Cargo); only codes that can follow the names. In the case of Spitfire
L.F.IXe, the "L.F." means light fighter, the "Mk"
stands for Mark (meaning major variant), the "IX" is the variant
of the design, and the "e" is the wing version (the IX had more
than one wing version).