August 8, 200619 yr I know there had been an issue in older FS versions with AI aircraft being able to go above appx. FL330. In FS9, I've got many of mine going up to FL 370 with no apparent problems. On longer flights, realistic flight plans call for FL 390 and even FL 410. Have you had success with these altitudes? Right now I'm not going any higher than 370.
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