Just wandring, which airline has the most economy seats on any aircraft in their fleet, and how many seats are there. Same question applies to business class, and same applies to First class.
Present and old configurations can be mentioned.
I started thinking about this, when I saw that LH used to have 99 biz seats on the 744.
We might want to start this for distinct types of planes (What is the most Y class seats on a 757? - example).