aeroplane vs airlift

aeroplane

verb
  • To transport by aeroplane. 

  • To fly in an aeroplane. 

noun
  • Any of various nymphalid butterflies, of various genera, having a slow gliding flight. Also called planes. 

  • Synonym of airplane. A powered heavier-than-air aircraft with fixed wings. 

airlift

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

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

  • Such a flight. 

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

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