accommodation ladder vs jet bridge

accommodation ladder

noun
  • a flight of stairs or a ladder for lowering over the side of a ship for access to and from a small boat. 

  • The property ladder, without the implication of necessarily owning the place where one lives. 

jet bridge

noun
  • An elevated corridor connecting an airport to a plane, usually enclosed and used for disembarking and embarking passengers and crew. 

How often have the words accommodation ladder and jet bridge occurred in a corpus of books? (source: Google Ngram Viewer )