Birky,
You should find it in Lasors. If I remember correctly though, theres actually quite a long thread on this already. Try a search and you should find it. From memory, its something like 'a flight which is carried out from a point of departure to point of arrival using navigation techniques'. The point of arival and departure can effectively be one in the same, as long as you head from the circuit area and do some flying then you should be ok.