airlift vs supersonic

airlift

noun
  • Such a flight. 

  • The transportation of troops, civilians or supplies by air, especially in an emergency. 

  • A pipe that is used to suck up objects from the sea bed. 

verb
  • To transport (troops etc) in an airlift. 

supersonic

noun
  • An aircraft that can travel at the speed of sound. 

adj
  • Ultrasonic, having a frequency too high to be audible. 

  • Greater than the speed of sound (in the same medium, and at the same temperature and pressure). 

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