airplane vs shuttle bus

airplane

verb
  • To transport by aeroplane. 

  • To fly in an aeroplane. 

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

shuttle bus

noun
  • Short-haul, limited-passenger buses, typically privately owned, such as by hotels, retirement villages, etc.; a shuttle. 

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