That's easy. Its the F4U that's going reeeallyyy fast.
But I agree, perk planes like the Tempest, 152 and F4U4 should NOT have their own icons. Visually its the same as the Tiffie, 190 and other F4U's.
I can easily tell the difference between the 109 versions when I fight them. Their flight characteristics and speed give them away. And I can usually guess what 190 im fighting most of the time.
So why perk icons for these planes?
Also, the La5 and La7 should have the same icon (just like Spit = spitV or SpitIX and P47 = all 3 jugs)... why? Visually they are identical!