Finish the Celestial Valley level in time attack mode with a time under 3:20:00 to unlock Bulk Star in Air Ride mode.
In the stadium (air glider), fly more than 1,300 feet; in the high jump, jump higher than 1,000 feet; and in the City Trial mode, fly through the rings in the sky five times or more to unlock the Dragoon in City Trial in free run mode.
Finish the Frozen Hillside level in time attack mode with a time under 3:14:00 to unlock Formal Star in Air Ride mode.
Finish 100 laps on any level to unlock Galax in Air Ride mode.
Defeat King Dedede in event stage 24 to unlock King Dedede in City Trial mode. Defeat a total of 1000 opponents to unlock him in Air Ride mode.
Break 1000 boxes to unlock Meta-Knight in City Trail mode. Accumulate at least thirty minutes of air time to unlock Meta-Knight in Air Ride mode.
Defeat 100 enemies on Exhaled Stars (Air Ride mode) to unlock Rex Wheelie in Air Ride mode.
Finish one lap in the Machine Passage level with a time under 1:05:00 to unlock Rocket Star in Air Ride mode.
Defeat 100 enemies with a quick spin to unlock Shadow Star in Air Ride mode.
Finish two laps in the Checker Nights level with a time under 3:05:00 (Air Ride mode) to unlock Slick Star in Air Ride mode.
Select Free Run, Time Attack, Sky Sands, and win it in 2:05:00 to unlock Swerve Star in Air Ride mode.
Except in Free Ride mode, cross the goal a total of three times to unlock Wagon Star in Air Ride mode.
Play all the standard courses to unlock the Wheelie Bike in Air Ride mode.
Do any course and on the last lap start in last, then win to unlock the Wheelie Scooter in Air Ride mode.
Finish in first place in the air to unlock Wing Star in Air Ride mode.
Use the Heavy Star to win Sandoola with a time under 1:30:00 to unlock Brown Kirby in Air Ride mode. Use the Wing Star and win Zeroyon Attack 2 with a time under 0:30:00 to unlock him in Air Ride mode.
Use the cannon to break an enemy ten times to unlock Green Kirby in City Trial mode. Inhale three Swordknights and win a race to unlock him in Air Ride mode.
Break an enemy vehicle five times to unlock Purple Kirby in City Trial mode. Win a two lap race in Airoon in under 2:30:00 to unlock him in Air Ride mode.
Build the Dragon and Hydra vehicles in one match to unlock White Kirby in City Trial mode. Win a two-lap race in Vallerion in under 2:30:00 to unlock him in Air Ride mode.
Glide for a total of one hour.
There is a random ability upgrade in one of the buildings. Also, if you break a bunch of trees, there is a hole you can drop down into. Inside are underground tunnels.
In City Trial, first complete the checklist mission "Fly through 5 mid air rings" in the City Phase. Then, assemble the three parts of the Dragoon (found in Red Boxes). You will now be able to ride the Dragoon until you are done with the stadium.