Originally Posted by
Backofthequeue
78X is slightly heavier on economy, proportions aren't EXACTLY the same as 772.
true, I should say similar. Nevertheless the 78X is bigger than the 772 and can carry more passengers. Though it’s narrower it’s about 20ft longer. I think if you take ANA domestic config on the 77E vs 781 they both have 28 premium seats which are the same design. The 77E is 392 and the 78X is 429. So you’re looking at almost 40 seats extra