jet set vs upper class

jet set

noun

  • A social class of wealthy people who travel for pleasure. 

adj

  • Relating to the life style of the jet set. 

verb

  • To follow the life style of the jet set. 

upper class

noun

  • those people at the top of a social hierarchy 

  • the aristocracy 

How often have the words jet set and upper class occurred in a corpus of books? (source: Google Ngram Viewer )