Balloon flight contest

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A balloon flight contest (also called a balloon race in some places) is a competition wherein the competitors attempt to send unmanned balloons as far as possible. Postcards are attached to the hydrogen or helium filled balloons which are then released into the sky. The flight of the balloons cannot be influenced by the competitors. Instead, success in the contest is dependent on the wind conditions and on the location in which the balloon lands. The contest depends on the goodwill of passers-by to find the balloons and return the postcards.