The plane is a previous Qantas and Jetstar commercial A330, which was bought in 2015 by Airbus and modified by Airbus into a freighter and air-to-air refueller.
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$250 million seems like a lot of money for a used Airbus.
The cost is in Australian dollars, so more like $170 million US, and it’s not just the airframe cost - this plane will have a lot of special features in terms of communications, etc - we’re not talking the same as something like Air Force One, but even a step or so down from that is still expensive hardware.