At 16 I would have thought he would settle down nicely in the cargo hold? I have moved both dogs and cats around, fingers crossed, so far no problems. I believe KLM let you take a small dog in the cabin, not sure about long haul though, that may get you as far as Malaysia, then Malaysian airlines takes over the route to Australia, don't know their policy on pet travel. Company here in Oz called Jetpets, may be worth talking to them, or their UK equivalent.