jet set vs main line

jet set

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

verb
  • To follow the life style of the jet set. 

adj
  • Relating to the life style of the jet set. 

main line

noun
  • A standard sequence of opening moves considered to be best play. 

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