Hi Mitsu, you may have these products already. If not, perhaps you would be interested in obtaining them?
I have three aircraft audio CDs.
The first is called "Checkflight Gustav" and is THE BF109G that was airborne in the UK in the 1990s. DAT recording included is in- cockpit, aeros, start up, shut down, land, take-off, etc etc. also featured are P38, P47, Spit XIV, P40, and P51.
The second is "Aero sounds - Military Aviation". P51, 109G, B17, Hurricane, Spitfire (Griffon & Merlin), P40. + Jets & helicopters.
The last is an old 1950s recording transferred onto CD which you may be able to digitally clean up, "The sound of the Aeroplane at War 1939-1945". Gladiator, Fulmar, Skua, Sterling, Wellington, Blenheim, Beautighter, Mosquito, Hurricane, Spitfire, Lysander, FW 190 A3, JU88, KI 102, Meteor, ME262.
You can buy the first and second CDs. The third CD is a one-off which I could post to you.
Regards, Dr Lecter.