Over on JF forum a guy has posted a link to .org with a small app he has produced, this app fools AH into thinking it is reading the default acf file, this then allows you to add new aircraft. This was the only feature not working and making AH1 incompatible with XP11. I have now been trying this app for a few weeks and would like to report that it works fine, sometimes you have to tinker with the fuel figures, my initial install of TB10/20 was showing that it only had enough fuel on a full tank for 92nm..... anyhow all sorted and that aside everything else is as per the original AH1 program,