Boeing has long maintained a leading position in the commercial narrowbody aircraft market largely due to the success of its Boeing 737 family. The 737 is the second-best-selling aircraft family ever, with over 17,000 orders and 12,000 deliveries completed since the first 737-100 made its debut in 1968. However, the program was eventually caught up by Airbus’ popular narrowbody family, the Airbus A320, which has since exceeded the 737 in both orders and deliveries.