I remember Kosuzu riding on Marisa's broom at one point. It doesn't really imply either way, though. Akyuu notes in PMiSS rather casually that people flying is common. Despite this, we don't ever see human villagers fly, and neither Akyuu nor Kosuzu have yet flown. The usual conclusion is that it's something to be learned, but even still I would expect anyone to want to be able to fly. The only humans that fly without excuse would be Sakuya and Mokou.