The Boeing 737-800 is the most successful variant of the 737 Next Generation family and one of the most-produced commercial airliners in history. It entered service with Hapag-Lloyd Flug in 1998 and became the industry standard for short-haul and medium-haul operations for the next two decades. The 737-800 carries between 162 and 189 passengers depending on cabin configuration and has a range of about 3,900 statute miles, enough to cross the continental United States or operate most short-haul transatlantic routes. Boeing produced more than 7,000 of them before ending production in 2020 to focus on the 737 MAX family. It remains in service with virtually every major airline that operates the 737 family, including Southwest, Ryanair, American Airlines, United Airlines, and Delta Air Lines. If you are on a 737, there is a good chance it is the -800.