Would be nice but it might increase the Internet requirements. If you think about it a little more you might come to the same conclusion as me:
If HTC now has to send the data of the plane's throttle position to all planes in the vicinity of "X" Kilometers, wouldn't that slow down the server or require a faster Internet connection to download all this data?
I definitely would enjoy it, but I think HTC would be at a loss with this feature, even if there's an "On / Off" switch.