Ren�,
I see your problem, and it appears I already pro-actively created a
solution for it in the past :-)
I noticed that the German OpenAir files at
http://www.daec.de/fileadmin/user_upload/files/2012/service/luftraumdaten/120312OpenAir.txt
support AC-records such as
AC TMZ
This does not seem to be an 'officially supported' OpenAir airspace
class, see the definition online at
http://www.winpilot.com/usersguide/userairspace.asp
Somewhere in the past, however, i *did* add support for such AC-records.
See the Parser.cpp source file from line 549 to 555.
So, for the TMZ's, just specify them with AC TMZ.
We might still want to discuss and decide on how these should be
visualized (polygon and polyline type).
Regards,
Bart