by Hooray » Sat Dec 02, 2017 11:38 am
that's all hard-coded stuff implemented in C++ unfortunately, it would be best to discuss this on the devel list unfortunately.
That is one of the reasons why an increasing number of aircraft developers are using custom route-manager implementations implemented in Nasal code, as they cannot easily access the underlying system, and because it's not documented anywhere (neither on the wiki, nor in the form of dedicated README files in $FG_ROOT/Docs).