probably safe. but now it appears the type of ground-to-air missile that can reach that altitude may be in the hands of people who have evil intent, one might say. the whole structure of civil aviation routing may have to be looked at. >> right. because it's not just this conflict area, it's others. people might think twice now about boarding a plane that flies over a war zone, essentially. >> yeah. well, all the routes to the middle east, the southeast asia, tend to cross a number of countries where things are a bit unstable. there have been civilian flights over afghanistan throughout the problems in afghanistan but nothing has happened to them. so, there's a sort of almost lullying into a false sense of security. it may well be the whole business of international routing will have to be looked at. that will impinge on costs