intentionally vs on the fly

intentionally

adv
  • In an intentional manner; on purpose. 

on the fly

adv
  • Spontaneously or extemporaneously; done as one goes, or during another activity. 

  • While in the air, without having touched the ground. 

How often have the words intentionally and on the fly occurred in a corpus of books? (source: Google Ngram Viewer )