What is the setting of One: A Novel by Richard Bach?

Most of the setting for the book is in the alternate world of spacetime with the Bachs traveling from place to place in their seaplane, the Growly. They enter spacetime where they are flying over Los Angeles. The Bachs see themselves meeting in Carmel. Leslie sees herself as a child in Upper Black Eddy where he made the decision to give up her music. Richard sees himself as a young fighter pilot in Arizona, eager to obey orders.