[mort 1]

Absolutely positive. I simply placed the Yak 1 after the Yak 15 (the Yak 15 had appeared between the 1 and the 1bis) and the plane re-appeared. No idea why this should be so but I'll take the fix. The part I find strange is why the air.ini had rearranged. I'm sure that the order these planes appear in the file is now correct. Could you do me a favour and check yours to see where the Yak 15 (which appears to have caused the problem) is placed in your air.ini :???: