aviation vs pilotage

aviation

noun
  • Flying, operating, or operation of aircraft. 

  • Industry that produces aircraft. 

  • A cocktail made with gin, maraschino liqueur, crème de violette and lemon juice 

  • The art or science of making and flying aircraft. 

  • aircraft 

pilotage

noun
  • The occupation of a pilot. 

  • The use of landmarks to guide a vessel or aircraft to its destination. 

  • The fee paid to a pilot. 

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