Originally Posted by
dereks123
That was my first thought but since BA Source says that Y layout is the traditional 3-3-3, why is MMB showing it as a 2-4-2?
My uneducated guess is that, because the front few rows in the “economy” section of this flight do actually have a 2-4-2 configuration, the software has assumed this is the configuration for the whole cabin, and re-aligned the 3-3-3 back section to fit. That ‘s left nowhere for the C seats to go, so they have been swept under the virtual carpet.