Airline Seat Space has Decreased
According to a Business Insider article and video, airline seat space has not only shrunk in length, but also in width. The cool video clip shows how airlines have cut the length between seats to as much as 4 inches. Check out the article and video for more details.
http://www.businessinsider.com/airline-seats-shrunk-over-time-coach-flight-travel-2017-12