Solutions
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JGSJW's post in FS 2004 ADDON Nightmare was marked as the answerEasy Fix. …… After noticing that my Addon File of 55 addon airports had somehow been sucked into the ADV file I removed it and placed it back in line on it’s own and instantly the 55 Scenery File Errors disappeared. All my airports and hangars and trucks etc are back in service. Thanks for the interest.
JGSJW