Hi B58. The Aggressor II has a one piece wing that bolts on from the bottom of the fuse. The Aggressor III has plug in wings and the entire canopy section is removable for better access to the forward internals. The II was engineered with mechanical retracts and the III with an air set-up. There are some additional differences but these are the main differences. I've owned 4 Aggressors over the years so please feel free to ask many questions! Good luck!

Spencer Maze
Calabasas, Ca.