Yeah I suppose that makes sense. I wasn't sure what the trigger was but the GPS piece is basically unavoidable then. Apparently it looks like other people have said it did work outside the US but I believe the Airsense was supported in North American models. Who knows, its just slightly irritating that DJI would disable it in other areas even thought its fitted with the feature. I guess I can just hope it's maybe changed in a future firmware update.
I hope so too. AirSense has been pretty useful for me in the USA so it would be a bummer if it's disabled when I (eventually) go abroad again.