ok
Actually an even better example. Those two same aircraft are at 90 degree angles to one another. So the wind coming out of the north does not affect the ac that is flying on lets say HDG 090. So are you going to tell me now, that groundspeed does not matter? I stand corrected on the example of 2 ac converging head on, as the wind would make one ac have a slower gs, and one a faster so it would equal out. But if they are on opposite tracks, such as what i just described then ofcourse groundspeed will matter as hitting the other ac will be the same as hitting a mountain