The Aéroplume, in France, is a helium blimp sized for one person. €60 gets you one half 60 minutes’s flight. I had to try it. ■ More about Aéroplume: https://aeroplume.fr ■ This is not backed: I paid for my flight at the usual price, I was the one to contact them asking approval, and Aéroplume had no article control. I am, nevertheless, impressed that in the ten years this has been going, no-one’s ever told me about it before!