Her ability to hover is nothing significant, aside from being able to reach spots that no one else can without using utility, and also her passive exists to aid her ultimate knives. I've wondered for a while now why Jett even has a passive given how unnecessary it is. Updraft already gives enough aerial mobility to have an advantage in fights using her knives, so how come Jett is the only character in the game with a passive? I'm sure we will see future agents have passive abilities as the variety of abilities begins to decrease, but I think it's weird how only Jett has a passive ability.