The low capital costs of the 767-300ER makes it cost competitive in the fuel scenarios that are likely within its six year lease period.
The 757-200W has fractionally lower direct seat mile costs than the 767, but it has lower capacity and its more limited range reduce its operational usefulness.
The A330-200 has the best operational flexibility but its higher capital costs makes it the most expensive aircraft to operate in the period of interest.
In a final article, we will add the revenue capability of the aircraft. This is where the A330-200 gets the chance to show if it can cover its higher direct costs with its higher earnings capability, thereby generating more value for the airline.