Index: TerrainConfig.cs
===================================================================
--- TerrainConfig.cs    (revision 6373)
+++ TerrainConfig.cs    (working copy)
@@ -1330,7 +1330,7 @@

                 var airfieldLua = System.IO.Path.Combine(airfieldDir, airfield.name + ".cfg.lua");

-                b.AppendLine("Airdromes[" + airfield.name + "] = {");
+                b.AppendLine("Airdromes[tonumber(" + airfield.name + "] = {");

                 b.AppendLine(string.Format("\tcode = \"{0}\",", airfieldData.Code));
                 b.AppendLine(string.Format("\tclass = \"{0}\",", airfieldData.Class));