why if I load a previously saved flight with a specific aircarft, FS9 freezes at 11%, while if I go to the same location with default cessna it will load correctly?Thanx and merry christmas to all of you

Immediate question is which aircraft?Some of the sophisticated add-on aircraft like to have the default Cessna loaded first and then be loaded over the top of it.If you are loading one of these add-ons without doing that, or worse, trying to load it immediately after another sophisticated add-on, you may well have problems.Also, is the aircraft you had saved still on your system? If the flight is looking for an aircraft which it can't find, then again, its bound to cause problems.

Thanx, but the culprit is not the aircraft. it happens with a variaty of them, noticeably with Flight1 C152, which is really not a complicated one(and it has been used for a long time in my FS9, and also loaded directly a number of times)