I think you are on a lost cause with this as the data would not be available. Even the revenue from sales would be hard to assess, bearing in mind offsets, leases, trade-ins and commercial confidence.
As for cost, that is and was a matter of complex accountancy when it came/comes to determining which costs are allocated to what aeroplane - e.g. even when only one aeroplane type is being produced the R&D for the next one may be significant and there would be product support cost for the previous types.
There have been many claims but they are not necessarily anything but guesswork. e.g. it has been claimed that we made no money from the sale of DH Doves/Devons but made a good living from their product support.
Last edited by Allan Lupton; 7th Feb 2018 at 16:02.