The Boeing 737 is a popular short-to-medium range, single aisle, narrow body commercial passenger jet aircraft. It has been continuously manufactured by Boeing Commercial Airplanes since 1967. More commonly known to the Boeing engineers as "FLUF", being an acronym for "Fat Little Ugly Fella", although the industry affectionately called it the "Baby Boeing". It incorporates a CFMI CFM56-7 engine. The 737-800 has a typical cruising speed of 0.785 Mach and a maximum range of 3,060 nautical miles. The 737-800, together with the 737-900 are among the largest members of the strong selling 737 family. The 737-800 was launched on September 5, 1994. The 737-800 has a flight crew of two. The 737-800 has a typical two class seating for 162 with 12 first class passengers at four abreast. It incorporates two CFM56-7B27s on high gross weight versions. By October 2002, there were 1,028 737-800s ordered with deliveries of 664. With over 7,000 ordered and over 5,000 delivered, the Boeing 737 is the most ordered and produced commercial passenger jet of all time. Born out of Boeing"s need to introduce a competitor in the short-range, small capacity jetliner market, it has been continuously manufactured since 1967. It is now so widely used that at any given time, there are over 1,250 airborne worldwide. On average, a 737 takes off or lands every five seconds somewhere around the world. Boeing was far behind its competitors when the 737 was launched, as rival aircraft were already into flight certification. To speed up the development time, Boeing reused 60 percent of the structure and systems of the existing 707, most notably the fuselage cross section. The 737-800 was a stretched version of the 737-700. It filled the gap left by Boeing"s discontinuation of the McDonnell Douglas MD-80 and MD-90 after the two company"s merger. Major United States airline Delta Air Lines has an all-Boeing fleet. It was one of the last major airlines to operate the original Boeing 737-200 models