Interesting. It only proves what I've always said about most profile art; it's usually done with a technical art approach, no feel for anything organic. Not that it's bad, but technical art seems cold and it's easier to do.
A few comments:
PlaneGrafx He's only got the one plane? F4U?
Janusz Swiatlon Some strong stuff, but a little heavy handed, and perhaps influenced by, or influencing Thierry Dekker.
(I did enjoy looking at his Zero, always nice to compare

)
Thierry's site
DEKKER-ARTWORK
Bob Pearson's stuff is nice and clean but a bit simple for my tastes. Plus, I have a bone to pick with him about using existing fonts to duplicate the strange and very goofy hand painted letters and numbers on WW1 British aircraft :P
He's got a very nice website here-
CBRNP.COM - Profiles
Skyraider
All 3D stuff, hard to tell how much is painted art and how much is 3D and application lighting.
What about one-time Targetware guy,
Jerry Boucher-
the VIRTUAL AIRCRAFT WEBSITE - Aviation Art & Prints by Jerry Boucher
He's really made the big time