The Airbus A320 and the Boeing 737 are among the most popular aircraft seen in the skies today, and between them, they dominate the market when it comes to short- and medium-haul narrowbody flying. Since being introduced in 1988 and 1967, respectively, both aircraft have gone on to become the workhorses of modern-day civil aviation. The A320 has had a next-generation overhaul with the A320neo (new engine option), while the 737 has undergone four main iterations, the latest being the 737 MAX.