In this admin approved challenge, you are asked to take the airplane listed in the post before your own, give the name of a related airplane and
explain why you considered the two to be related (eg. engine type, one plane intended to replace the other, sworn enemies, etc.). You may designate marks but the next poster should not reply with a different mark of the same airplane (eg. Spitfire Mk. V should not be followed by Spitfire Mk. IV, F-14 A should not be followed by F-14 B, etc.) unless you are at a complete loss. It would be nice to see you guys think outside the box a bit. You may also include an image of the plane you mention as well as a link to more information on the plane, although this is not required.
I will begin with the Supermarine Spitfire (Mk. IX)
