$IDOI After 9/11, global demands for security have increased greatly, especially in airports and other travel hubs. A variety of changes were made, which required security companies to expand on their previous technologies in order to keep up with the demand. This demand has caused the aviation security industry to grow to a $22.3 billion industry as of 2013, and it is expected to reach $36.99 billion by 2018 according to research authored by Markets and Markets.