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A bit of copy & paste from mesh format specification for vessels:'FLAG 9' will make it cast no shadow and be transparent also.
0x00000001|Do not use this group to render ground shadows
0x00000002|Do not render this group
0x00000004|Do not apply lighting when rendering this group
0x00000008|Texture blending directive: additive with background
So FLAG 9 means: don't use this group to render ground shadows, and applied texture is additive with background.