Bowser Jr. Cup
From the Super Mario Wiki
The Bowser Junior Cup is a Cup that appears in the game Mario Kart Arcade GP DX. It is the fourth out of the six cups in the game. It also appears to be a follow-up to the fifth cup, the Bowser Cup. Its two courses it contains are Aerial Road and Sky Arena.
Its courses are based off of the cloud worlds from the New Super Mario Bros. series. Its courses also reference Cloudtop Cruise from Mario Kart 8, and also contains a few references to the Super Mario Galaxy series, which both games contained a lot of Airships, which are commonly found in the Bowser Junior Cup.