840 is a tough call, even for an A380. That would require an average seat pitch of about 30″. On the plus side: unmatched operating cost per available seat mile and very low fuel consumption.

What was the actual seat pitch on the frame with 853 seats? (The toilets were not omitted – they were replaced with cameras. It had only 8 seats abreast on upper deck, and only 10 seats abreast on middle deck.)