Same Airplane, 22 Years Apart: How The Boeing 777-300ER Quietly Transformed
The Boeing 777-300ER, introduced in 2004, has undergone continuous, subtle transformations over two decades, remaining a core long-haul aircraft. These improvements include structural weight reductions, aerodynamic refinements, and engine enhancements, all contributing to better fuel efficiency and performance. Furthermore, cabin interiors have seen significant upgrades due to evolving passenger expectations and the extended lifespan of the aircraft caused by delays in its successor, the 777X.
https://simpleflying.com/how-boeing-777-300er-quietly-transformed/