Lufthansa says the 777X is 15% more efficient than the 300ER? I assume this means per trip?
Can someone work out what that means per seat?
Hard to say what they use as an initial data set. As LH does not operate the 77W we could take LX's 77Ws as a reference. Now they do not have J/Y+ yet but I guess the comment only makes sense if we compare todays seating with what is possible.
As of now the 77W seats: F8 C62 Y270.
The question is, what seats would you add and do we fit 20 or 30 more Y seats in? But if we add 30 additional Y seats the capacity goes from 340 to 370 seats, an increase of 8.8%.
That leaves about 6-7% in efficiency gain left. So roughly the 777X would transport 8-9% more pax and burns 6-7% less fuel for a total efficiency gain of 15% over the 77W.
But this is not really accurate I guess.