balloonist
From Longman Dictionary of Contemporary Englishballoonistbal‧loon‧ist /bəˈluːnɪst/ noun [countable] someone who flies a balloonExamples from the Corpusballoonist• For several years weatherman Paul Damari has been operating an independent weather service for balloonists.• In the next five years he made about forty ascents as a professional balloonist.