Controlled airspace rules vary between countries, with America being less strict than Australia. The Owens valley in Califonia is a prime hang gliding site and also appears to be used as an airforce training ground. I recall one particularly scary incident out in the middle of the valley; I was heading out to land, about 1000 feet above the ground, when I hear the sound of jet engines - 3 jet fighters fly through below me and another at my height but off to the left. I guess the locals get used to it but when the buggers jump on you from out of nowhere it really gets the adrenaline pumping. This kind of mixed flying is not allowed in Australia.
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