Why Can't The Boeing 777-300ER Be Powered By Any Other Engine Type?

Why can't the Boeing 777-300ER be powered by any other engine type? The article explains why Boeing chose GE90 propulsion for the 777-200X and 777-300X, and why alternatives were not pursued. In 1999 Boeing selected the GE90-115B to power the next-generation variants, a decision hailed by GE’s James McNerney as a major milestone. Boeing argued GE offered the best balance of technical capability, schedule, and service; Pratt & Whitney lacked a workable solution, while Rolls-Royce proposals raised questions and market concerns. The 777-300ER entered service in May 2004, with GE90 derivatives entering service earlier; the engine extended range for related models and supported the broader 777 family development. A total of 226 of these original aircraft were delivered with Rolls-Royce engines.