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The 777-300ER would be more heavier at MTOW proportionally, and the 777-9X, despite of the stretch and larger wingspan, will remain the same MTOW of the current-day 777-300ER. That means, that will be relatively lighter at MTOW, but not at OEW.
I never said the 777-9X OEW would be more lighter, I also said was heavier due to the fuselage stretch. You were right on the Aluminium issues also, but you should make a more carefully read to see what I meant. There is no nonsense, I am not dodging you. However, the graphic lacked important details about the wingtip type, wingtip material and engine materials added on manufacturing. The A350-1000 at 690,000 lbs would really more efficient? Only if you wanted 9-Abreast seating in economy. Tha 777-9X would be more efficient at 10-Abreast in economy, and that’s why companies like JAL placed an order for A350s rather than 777Xs. (despite of the slot constraint)