On July 3, 1984, U.S. Patent No. 4,457,509, issued to Jean St-Germain on a Levitationarium for Air Flotation of Humans

As the patent explains, “[t]his invention relates to an installation to levitate human beings by an upward flow of air, and in particular, to a levitationarium in which air flotation of humans is produced, either for the sole fun and enjoyment of users and spectators or for training, such as to practice free fall by parachutists.”