One title on the list:
The Baron in the Trees by Italo CalvinoRead about another balloon flight on Mullan's list.
Cosimo has abandoned his aristocrat inheritance for a life in the canopy of the trees that surround his childhood home. He says he will never touch the earth again. When he is near death, people gather to see him fall to the ground. But then a balloon appears above the trees, trailing a rope. Cosimo catches the rope and disappears.