Noun
An aeronaut.
Source: Webster's dictionaryA balloonist named John Steiner of Philadelphia made an ambitious trip across the lake in 1857. Source: Internet
A BALLOONIST DROWNED.; Particulars of the Fatal Accident to Prof. Atains in Tennessee. Source: Internet
Rolls was also a pioneer aviator and initially, balloonist, citation making over 170 balloon ascents. Source: Internet