airborne vs flapping

airborne

adj
  • In or carried by the air. 

  • Fitted to an aircraft. 

  • In flight. 

  • Transported by air in an aircraft. 

noun
  • Military infantry intended to be transported by air and delivered to the battlefield by parachute or helicopter. 

flapping

adj
  • that flaps or flap 

noun
  • The situation where a resource, a network destination, etc., is advertised as being available and then unavailable (or available by different routes) in rapid succession. 

  • The unlicensed racing of horses or greyhounds. 

  • An instance where one flaps. 

  • A phonological process found in many dialects of English, especially American English and Canadian English, by which intervocalic /t/ and /d/ surface as the alveolar flap /ɾ/ before an unstressed syllable, so that words such as "metal" and "medal" are pronounced similarly or identically. 

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