The Boeing 737 MAX family comes in four variants, or four and a half if the MAX 8-200 is included. The MAX 8 replaces the popular Boeing 737-800 and is one of the best-selling aircraft on the market today. To meet the requirements of Europe’s ultra-low-cost carrier, Ryanair, Boeing modified the MAX 8 to give it extra seating. Ryanair wanted the aircraft to be extra-high-density, as it seeks to bring down the price per seat as much as possible.