Tony,Sorry I can'y answer you directly on your post. Trouble with the forum ?Yes, there are mistakes ;-)1 : At KPVD runways are 05R/23L and not 05/23.2 : If you only wrote way for runway 23L, when opening Fly with default wind (0 knots from north), default runway will be 05R.3 : you use 'D' instead of 'd'. 'D' is for heavy aircraft (not yet implemented.4 : you forgot holding point (wrote '1' in column 'type' in VolNav)5 : there are two unuseful point on the runway : aircraft will increase speed to take off when reaching last point.The right one with reverse for landing :KPVD;05R;a;P1;0;0;150229.699919;1038884.457748;0;150231.840617;1038879.680505;0;150226.379630;1038875.543394;0;150225.709629;1038863.880368;0;150225.552208;1038853.037510;0;150211.651515;1038841.288115;0;150213.306360;1038838.309395;0;KPVD;23L;d;P1;0;0;150213.306360;1038838.309395;0;150211.651515;1038841.288115;0;150225.552208;1038853.037510;0;150225.709629;1038863.880368;0;150226.379630;1038875.543394;0;150231.840617;1038879.680505;0;150231.087441;1038881.631178;1;150229.699919;1038884.457748;0;>> Also, after pressing these keys, FLY will not close properly. I know this fact (solved). I'm working on a new version (on test) with new function. But I have to control all english text as I change some text in the french version !Good flightDidier

Thank you, Didier. I've used your text lines and got the AI planes to work in PVD. I can use these lines to learn how AI works. One question, when I load the taxyway file from VOLNav( from the ATC screen) and click on an AI path for any airport listed, the mouse cursor generates "an error of d'etendue" when it moves around the map. I've tried everything , but still don't understand what generates this error. In fact, when it starts to appear in an uncontrolled manner, I am forced to quit for the day out of despair....I know Volnav is an act of love, Didier....;-)tony

Thanks for your help, Tony.VolNav v1.51 with corrections has been downloaded today :-)