The fantasy of a flying house was born out from director Pete Docter's thoughts about escaping from life when it becomes too irritating. In 1939, Carl Fredricksen is a shy 8-year-old boy who meets an outgoing and rather eccentric girl named Ellie and discovers they share the same interest in adventures as their hero, famed explorer Charles Muntz. Ellie expresses her desire to move her clubhouse to Paradise Falls in South America, a promise she makes Carl swear to keep. Years pass, and Carl and Ellie marry and grow old together in the old house where they first met while making a living as a toy balloon vendor and a zookeeper respectively.
Unable to have children, they also try to save up for the trip to Paradise Falls but other financial obligations arise. Just as they finally seem to be able to take their trip, Ellie dies of old age, leaving Carl living by himself, becoming sour and missing his wife terribly. As the years pass, the city grows around Carl's house with construction as he refuses to move. After a tussle with a construction worker over his broken mailbox, the court orders Carl to move into Shady Oaks Retirement Home.
Carl comes up with a scheme to keep his promise to Ellie, and uses his old professional supplies to create a makeshift airship using 10,000 helium balloons which lift his house off its foundations. Russell, a Wilderness Explorer trying to earn his final merit badge for "Assisting the Elderly", has stowed away on the porch after being sent on a snipe hunt by Carl the day before.[Wikipedia]
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