|Quoting Stitch (Reply 50):|
Well there is the 787-10 and 777-8, with the latter being around 5% larger in terms of cabin floor area and with significantly more range.
Boeing market their range as having 15% capacity jumps between all of the models, of course, including 787-10 - 777-8X
It makes a good point though.
The 777-8X is only 1.2m longer than the 787-10X (69.5m vs 68.3m) and a complete seat width wider. It also has considerably greater range.
The A350-900 is a full 3.2m longer than the A330-900 (66.8m vs 63.6m), and a complete seat width wider. It also has considerably greater range.
The point remains, that in terms of size, 787-8 to 787-9 to 787-10 is almost, not quite, but almost, exactly the same as A330-800 to A330-900 to A350-900
The A330-900 and A350-900 do not overlap on size.
Most of the conversions from the A350 to the A330 that we have seen are because those airlines really wanted a widebody that was smaller and lighter than the A350-900, and the A350-800 wasn't it.
Availability might have played a part.