Source
The numbers game
When the Harper cabinet approved the purchase of 65 F-35 fighter jets last year, National Defence said the project would cost $15.92-billion. The number has since risen to $17.6-billion, breaking down as:
$7.3-billion - initial acquisition and logistics costs
$10.3-billion - “sustainment services” for 20 years and upgrades
The government's acquisition numbers come from the Joint Strike Fighter program, led by Lockheed-Martin in the United States in partnership with other allied countries, and an estimate of traditional maintenance costs for fighter jets.
The Parliamentary Budget Officer is evaluating the total project at $29.3-billion, predicting:
$11.4-billion - acquisition cost
$17.9-billion - sustainment costs over 30 years, including $3.9-billion in upgrades (or double National Defence's estimate)
The PBO analyzed historical costs of complicated aircraft and military procurements, which are frequently over budget and require large upgrades over time. In addition, it pointed to ongoing uncertainty in the United States over the state of the development program.