I'm not sure if anyone has pointed this out but the glider on the main menu looks like the glider from the skydiving game in Wii sports resorts. In other words we're
Wii Sports Skydiving Experience by FinalEndless on Newgrounds
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Wii Sport Resort - Wii - Skydiving (Test) - Part 2 - YouTube
Development:Wii Sports Resort - The Cutting Room Floor
Air Sports | Wii Sports Wiki | Fandom
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going pro in every wii sports resort sport - skydiving - YouTube
Development:Wii Sports Resort - The Cutting Room Floor