How to set ATC AIRLINE SimVar through SimConnect?

Does anyone know how to programatically set ATC AIRLINE Simvar through SimConnect, thus overriding the setting from aircraft cfg? SDK says this variable is SETTABLE, but I haven’t been thus far successful. My code compiles and seems correct (even corresponds to what AI spewed out), but the SimVar simply stays what was set to in aircraft.config.

I have solid experience with SimConnect and I have been setting and retrieving SimVars left and right, but this one refuses to budge.

Way back in the early FS2020 days, it used to only take the new value when you switch to a new ATC agent/frequency. I’m guessing that’s still the case, but haven’t tried it since then.

Ok - thanks. That’s too bad.