The primary difference between the Boeing 777-200ER (Extended Range) and the 777-200LR (Longer Range) is their operational distance and structural capacity. The ER version, introduced in the late 1990s, was designed for standard transoceanic flights with a range of approximately 7,065 nautical miles. The LR, nicknamed the "Worldliner," was introduced in 2006 to push the limits of aviation, boasting a massive range of 8,555 nautical miles—capable of connecting almost any two cities on Earth. To achieve this, the LR features a significantly higher Maximum Takeoff Weight (MTOW), more powerful General Electric GE90-110B or -115B engines, and "raked wingtips" that improve aerodynamic efficiency. The LR also includes optional auxiliary fuel tanks in the rear cargo hold. While the ER was a massive commercial success with over 400 deliveries, the LR is a niche aircraft with only about 60 produced, as its "extreme range" often results in higher fuel costs that only make sense on ultra-long-haul routes like London to Sydney or Newark to Singapore.