Just for fun, wanted to know which flight is performing the best and has the highest profit. Doesn't have to be exact (as this is impossible, LF changes every flight).
Riyadh Airways, flight from Riyadh OERK to Lisbon LPPT, 2917NM, makes a profit of around 165K per return flight with a LF between 85% and 90%. It is flown with a 757-300.
Interested in your flights!