This is heavily dependent on fuel prices. At lower fuel prices, the decreased overheads of the larger planes (landing fees, staffing, etc) make them worth it. T

This is heavily dependent on fuel prices. At lower fuel prices, the decreased overheads of the larger planes (landing fees, staffing, etc) make them worth it. The CEO of Qantas is on record that it doesn't take much of an increase in fuel price for it to be better for them to run two of the (much more efficient) 787s than 1 A380. I assume the 777s are similar.