Madasacow,
A little bird named Concorde, if you wouldn't mind keeping out of the North Atlantic with your toys..
Long ago, back in the mid-seventies, A U-2 hit was hit by the shock wave from Concorde en-route Bahrain-UK (Mach 2+). The pilot only just got it back on the ground and it had to be shipped home for repair. As he mournfully said afterwards. "Bigger than me, that I can live with; faster than me, that I can live with; Bast**d was above me, that hurts".
On a more sober note, the ones he is worried about are the one's below FL350, not the UAVs.