Originally Posted by Taildragger67
Pardon my ignorance (and being too lazy to try boeing.com), but what's the 787 in cattle - 8 or 9 across?
Despite Boeing´s advertizing - 9 for most customers.
As for widebodies:
Boeing 747 (650 cm wide outside, 610 cm inside) started with 9 abreast, 3-4-2. However, soon it was 3-4-3 pretty universally.
DC-10 (602 cm outside) often flew 8 abreast, 2-4-2 in coach. However, 9 abreast soon appeared - as did 10 abreast, like 3-4-3. You can still enjoy 3-4-3 in many MD-11s, like Finnair Coach.
Tristar (597 cm outside) also often flew 8 abreast - and 9 abreast and 10 abreast soon appeared.
A300 (564 cm outside) mostly kept 8 abreast. But not always: there are 9 abreast 300/330 planes around, although still few.
B767 (503 cm outside) is mostly 7 abreast - but 8 abreast 767-s exist. They are still few.
B777 (619 cm outside) is mostly 9 abreast, but 10 abreast is obviously possible, as it is on DC-10 and Tristar.
B787 is 574 cm outside. Most customers want 9 abreast like on many Tristars, not 8 abreast like on A350.