We' be using a chunk of our OneWorld miles to get to BKK in Cathay Business. Final destination, however, is Koh Samui and I can't find a mileage partner that will get us there? Does anyone have an idea of how to do this without coughing up $300 by using Bangkok Airways or some other discount carrier? Thanks! Cathay was able to get us to Bali last year in great style but then we had to purchase two one ways to get to Phuket on Air Asia.