LH group A340 300s
What is the reason for some Airlines preference post pandemic to keep the older A340-300s flying vs the newer A340-600s e.g Lufthansa? I understand they are larger however, with the newer engines on the 600 i would imagine there is not much between each fuel economy wise plus the 600 is a much more dynamic Aircraft.
in some cases (again LH group) the A343 has even been flying instead of newer, similar sized, more economical AC like the A350.