By now I have FU3 patched + SanFrancisco2003 + Seattle2003 installed...I want to install the Markus Brunner's addon (Portland, LAX, radar controller in the outter terrain...etc).What is the process please with commons files (Mods file, airspace.txt, Aiplan.txt, EXT_PORT.txt) ?Must I to mix them ?Is someone did it ?Thank you in advance.Regards.Richard.

I think there were instructions in Markus' package - they key was to use a word editor like notepad to just add the extra lines, not to overwrite the file (which means you would lose newer AI information). Anyone else done this more recently?RobD.