As it's not possible to book partner flights or search for seats online, you'll need to look for available award seats on the partner airlines website. (rewardexpert.com)
There are a lot of business class award seats available on this route for 2016, even during the hottest travel times. (rewardexpert.com)
However, even just days before departure, you can sometimes find 3 first class award seats available for booking. (upgradedpoints.com)