Well i turned off AI traffic in the sim and was disappointed to see that while it shows a bunch of parked planes at the airport still, I do not see any user planes flying even though i see them in game. Has anyone able to get data on another user’s plane? I’m using the call RequestDataOnSimObjectType trying both User and Aircraft types. I haven’t tried “ALL” as that would be a lot more data than is actually needed and a lot more filtering I’d have to do, but that’s my next thing to experiment with.
Well, looks like I’m out of luck for now 
https://devsupport.flightsimulator.com/questions/5086/onlinemultiplayer-traffic-not-being-returned-in-tr.html