How to unlock dragoon
In City trial, you must complete the following.
1.In the Stadium, you must jump higher that 1000ft in the High Jump
to do this, get a lot of boost and glide symbols, use the jet star and make the stadium options only high jump
2.During one game, fly through the rings in the sky 5 or more times
This is the easiest one. All you have to do is go to the warp in the back between the volcano and the last building and glide through the nearest rings
3.In the Stadium, you have to fly farther than 1300ft in Air glider
Get a lot of glide and boost symbols and pick up the winged star and make the staduim only air glider