It is one of the vehicles which as a time patroller you can unlock to float around the conton city. In conton city (doesn't matter in which lobby you are), just fly up to a great amount of height, just above the floating islands and search around the city (a little bit nearer to the namekian's area, to the patroller's school or mushroom's area) for a flying person named 'Oba' and talk to him, and in return for finding him, he will reward you with the flying nimbus.