The word is often associated with someone's profession or hobby related to flying balloons.

Occupational Use

Balloonist suggests a sense of adventure or exploration, often in the sky.

Adventure Connotation

It's a relatively rare occupation, so the term isn't as commonly used as other professions.

Not Prolific

 But the ends of all those balloon trips were, you know -- something seemed to go wrong every time, and on that particular occasion, the more experienced balloonist who was with me jumped, and left me holding on for dear life.