I have two of the Previous Heller issued 1/72 scale Boeing E3 awacs kits with the older JT3D engines, which when Airfix updated the kit to a RAF version with the CFM56 turbofans, I know that there is tons of the older heller versions knocking around on the net for sale but very few of the Airfix version, and very expensive too, contrail did produce the cfm engines but are also very rare and expensive, perhaps if possible Airfix could have a think to reissue the kit but I would assume have the capability to produce the JT3D engines together with the CFM56 ones and perhaps even an upgrade kit for us with the older kits!