prove out vs see how it flies

prove out

verb
  • To turn out to be feasible, accurate, true, satisfactory, as expected, hoped, stated, etc. 

  • To demonstrate the feasibility of; to show or be shown to be feasible, accurate, true, satisfactory, as expected, hoped, stated, etc. 

see how it flies

How often have the words prove out and see how it flies occurred in a corpus of books? (source: Google Ngram Viewer )