Airbus has shrugged off criticism over its redesign of the A350-1000, insisting that it will not keep changing the twinjet simply to appease individual customers.
Emirates and Qatar Airways, each of which already had 20 A350-1000s on order before the revamp, have been particularly harsh about the changes to the aircraft.
Influential leasing chief Steve Udvar-Hazy has also questioned the type's ability to compete with the Boeing 777-300ER.
But Airbus chief Tom Enders, speaking to Flightglobal at the airframer's Broughton wing plant, said the manufacturer had "fought long and hard" to achieve the current configuration.
"For us, that is the solution," he said. "We're not going to redesign it every half-year."
Airbus's redesign efforts have concentrated on the Rolls-Royce Trent XWB engines, which will have a higher thrust capability but will lose commonality with the powerplants for the -900 and -800 variants.
Adjustments to the wing, and an increase in maximum take-off weight, will also feature in the revamp. The airframer aims to give the aircraft an additional 400nm range.
Etihad Airways has 25 A350-1000s on order while Korea's Asiana has the remaining 10.