Originally Posted by
djk7
Airbus narrow body planes are a little wider than Boeings, so typically have around an inch more seat width. IFAIK, there isn't much difference in width between different airline's 320 series, but compared to 737/757 (and 707/727), you get the extra inch.
Generally that is the case. But some airlines use the same seats on A320 planes, meaning the extra width is in the aisle.