Used miles through AA to go LAX-Brisbane (on Qantas). Booked separate flight, same day, to go Brisbane to Gladstone. Called Qantas and asked about adding flight due so I don't have to go out security, grab back, then go back through. They said I had to go out. Anyone have luck adding a flight (I get free luggage so that's not a concern, it's leaving secure area and rechecking)?