thx moggel for your quick answer....
well i looked again in the fmb, and it seems, that all objects under the category "static" have this offset function....
there are really many objects included...i could for example place a bycicle or a tent at 5000m altitude if i wanted to, but there are no hangars or plane halls included in the static section.unfortunately, these objects are all placed under the category "buildings" which appear to not have this offset function...
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