Balloning or Ballooning: How To spell?
The word Balloning is misspelled against Ballooning, a noun meaning "The art or practice of managing balloons or voyaging in them."
Ballooning has double "oo" is mispronounced as "o"Remember double 'OO' in between the strings ball & ning which should not be misspelled with single 'O'
Wrong Spelling:  ball-o-ning  Correct Spelling:  ball-oo-ning 
Find more incorrect spellings of Ballooning to spell right way.