How many seats go in a 747?

Not how many people do – over 1000, with seats removed, and 674 from Darwin.

Rather, what is the maximum number of seats actually installed and flown commercially?

Corsair seems to fly 747-400 with 582 seats. 522 seats on main deck, all cattle till nose (yet they do have toilets and galleys), and 60 seats on upper deck: 24 business class seats (5 abreast, with pitch being… what? 36´´? 38´´?) and 36 cattle seats. There have been mentions of 587 seats… were they mistaken?

JAL 747-400D has 546 seats. Business class (8 abreast, also 38´´ or so pitch) is at the front of main deck, and they have all-cattle upper deck. With, it seems, 86 seats.

How many seats does ANA 747-400D have? And what about 747-300SR-s?

Now Boeing is not interested in building 747-800D. But this does not mean 747-8 is unsuitable for longhaul low-frills service… say Corsair buys some to compete with Outre Mer 380-s 840 seat single class frames.

Is it correct that 747-8 has no extra doors compared to 747-400?

4 m stretch in front would mean adding about 5 rows (30 seats) to upper deck. But adding these to 86 would reach 116, and with 2 doors, 110 is limit.

Corsair and JAL both have seats next to the straight stair. How much does the 747-8 new curved stair take up floorspace, and how would upper deck cattle seats be squeezed around stairs? Adding 24 seats is the maximum possible.

5,5 m stretch of main deck would mean 7 rows, 70 seats. Since Corsair already has 522, that would mean 592, which is impossible because 10 doors means 550 maximum. So, the most sensible thing to do would be to put the few business or premium economy seats in the main deck nose, to keep the total seat count at exactly 550.

Would we see (and fly) exactly 660 seat 747 any time soon?