aeroplane vs airline

aeroplane

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

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

verb
  • To fly in an aeroplane. 

  • To transport by aeroplane. 

airline

noun
  • A company that flies airplanes to transport people and goods. 

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