The Boeing 737-800 is a narrow-body, twin-engine commercial jet airliner developed by Boeing Commercial Airplanes. It is part of the Boeing 737 Next Generation (737NG) family, which was designed as an upgraded version of the earlier 737 Classic series. The 737NG family includes the 737-600, 737-700, 737-800, and 737-900. Among these variants, the 737-800 became the most popular and widely produced model.The Boeing 737-800 was launched in the 1990s as a direct competitor to the Airbus A320. Its first flight took place in 1997, and it entered commercial service in 1998 with Hapag-Lloyd Flug (now TUIfly). Since then, thousands of units have been delivered to airlines around the world. Because of its efficiency and flexibility, it became one of the best-selling commercial aircraft in aviation history.In terms of design, the 737-800 features a low-wing configuration with two CFM International CFM56-7B turbofan engines mounted under the wings. These engines are known for their reliability, fuel efficiency, and relatively low noise levels compared to older engines. The aircraft also commonly uses blended winglets or split scimitar winglets, which reduce aerodynamic drag, improve fuel efficiency, and increase range.The Boeing 737-800 has a length of approximately 39.5 meters and a wingspan of about 35.8 meters (with winglets). It stands about 12.5 meters tall. The aircraft typically cruises at an altitude of around 35,000 to 41,000 feet and has a cruising speed of about Mach 0.78 to Mach 0.79 (around 842 km/h or 523 mph). Its maximum range is approximately 5,400 kilometers (2,900 nautical miles), depending on passenger load and configuration.Passenger capacity varies depending on the airline’s seating arrangement. In a two-class configuration (business and economy), it usually carries between 162 and 178 passengers. In a high-density, single-class layout used by many low-cost carriers, it can carry up to 189 passengers. The cabin layout typically features a 3-3 seating arra