The Rolls-Royce Trent XWB is the turbofan family developed for Airbus A350 aircraft. The Trent XWB-84 powers the A350-900, while the higher-thrust XWB-97 serves the A350-1000; the XWB-84 EP is an enhanced-performance development. These engines share a family identity but differ in configuration and application. Family-level performance claims therefore need to be read alongside the specifications and approved operating limits of the exact XWB model.