Load factors
Sorry you didnt read my post and understand it-- Any Airline wether Boeings or Airbus that fly at MAX ALT will not be doing it for very long--lack of revenue
THE A320 CAN ONLY REACH MAX ALT OF 390 AT 62 TONS some 15 tons under max t.o.
We fly in the mid 30s with about 160 pax and I know the A320 has a better wing than the 800ng