Dear open aviation map developers,
I was working on own rendering engine of AIXM data. When I imported AIXM data from openaviationmap I can see some artifacts. See attached screenshot.

Currently I am testing tileMill renderer. I was using osm dump of openaviationmap and I have very similar results (with artifacts). I wasn't able to figure what sql queries will correctly perform union on those polygons.
I am attaching screenshot of my renders of Czech airspace.

regards,
Jozef