The 737-500 was supposed to be a replacement for the 737-200. It was only made because customers wanted it. The -500 is 1 ft 7 in (47 cm) longer than the 737-200. It can carry up to 132 passengers. Both modern and older cockpits could be installed on the 737-500. Using the CFM56-3 engine burned a lot less fuel than the engines used on the 737-200s.