I have a Viscount 700D purchased new in 1969 for $3.5 and in 1993, it accrues $124,000 in depreciation weekly or $6million annually!
This is the message from the aircraft screen explanation for depreciation:
This is the current calculated value of the aircraft in your bookkeeping.
Aircraft value is calculated using a straight-line depreciation method so that the residual value at the age of 25 years is 10% of the original price.
Original purchase price: 3 174 500 USD
Weekly depreciation: 124 450 USD
Yearly depreciation: 6 471 400 USD
Mark Plank
Aero Italia GW3