Hey Chuck, I believe that is indeed pink
. Naruke often used pink as a secondary scheme for his planes, usually replacing yellow. His winning Aurum Super Z in '97 was also in two schemes, with pink replacing yellow on one of them. Later Naruke designs made by Kyosho like the Aurum, G-Trick, and Sonic had both pink and yellow schemes.
Pink is pretty much a standard color in pattern with the Japanese flyers (Akiba especially, e.g. Beat-On), especially the underside. In fact it's a favorite for Chip (used as primary color on almost all is planes, Jekyll, Hydeout/away, Ultimate...), and CPLR as well (Topline comes to mind). Got pink?
(source:
http://www.mat.uc.pt/~pedro/ncientif...s/wc97all.html)