Compare UPS' bottom line to any other shipping/freight company. Compare the profits of each company compared to revenue. They are unmatched! Have you ever heard the term of working smarter not harder? How many of those flights are full both ways for CX? Even if they are full then what profit returns are they getting to sell the open space?
This is how UPS can "downgrade" themselves with "only six " 747 flights a week and be the largest shipping company on the planet