This aircraft utilized one less engine than previous models and was thought to significantly more comfortable and reliable than competitors' products. Because most models are eventually discontinued to allocate resources to "new and improved models," the 727 was discontinued in 1984; however, by the beginning of 2000 almost 1,300 of these planes were still in service. Boeing achieved additional commercial success in 1967 and 1968 with the production of the 737 and 747. The 737 would become the best-selling commercial jet aircraft in history while the 747 would hold the passenger seating capacity record for 35 years. The 747 utilizes a double-decker configuration, allowing for a maximum of 524 passengers on board.