Pilotwings Resort

Diamond class
Get a "3 Star" rank in all Silver, Gold, and Platinum class missions to unlock the Diamond class.
Meca Hawk Diorama
Get a "3 Star" rank in all missions in Mission Flight mode. Meca Hawk can be found walking around Wedge Island in Free Flight mode.
Super aircraft in all missions
Get a perfect score in every mission to unlock the super aircraft in all missions.
Castle on Private Island
Collect all 75 Sight Rings in Free Flight mode to get a Castle on Private Island.
Free Flight vehicles
Successfully complete the indicated task to unlock the corresponding vehicle in Free Flight mode:
Cycle Glider: Successfully complete all Gold class missions.
Super Rocket Belt: Successfully complete all Platinum class missions.
Turbo Jet: Successfully complete all Silver class missions.
Free Flight collectibles
Reach the indicated class to unlock the corresponding collectible in Free Flight mode:
Balloons: Silver class
Extras: Gold class
Extra Free Flight mode time
Collect twenty white balloons to get twenty more seconds in Free Flight mode. Go through all sixty gold rings to get more time in Free Flight mode.
Evening and Night in Free Flight mode
Collect 30 I Rings to unlock Evening in Free Flight mode. Collect 45 I Rings to unlock Night in Free Flight mode.
Alternate ending credits
Successfully complete all missions with a perfect score to alternate the ending credits.
Mario reference
In the "Three Minute Glide" mission, the sound of Mario dying can be heard when you fly through the small village.