Thanks Dave.

I do like look of the Zero, but it doesn't get flown very often.
As for AiTX, it's not bad. I had a couple of bugs, informed the dev & he fixed them in under 24 hrs. Pretty good service, but of course it would have been better if they had not been there in the first place.
The prog is more versatile than ATFX but needs refining IMHO. For instance, you can add up to 20 aircraft in formation with either your own aircraft or an AI one, but you have to add them one at a time. The formation can be saved but only if they have been added to another AI, and not your own aircraft. Also only the layout is saved so when it's reloaded all the aircraft are the same.
Dave G.