I want to fly from Singapore (SIN) to Xiamen (XMN). Xiamen Air has direct flights, and their website says it would cost 30000 miles from Southeast Asia: https://www.xiamenair.com/en-cn/egretclub/usepoints.html
I have sufficient SkyMiles on Delta, and Xiamen Air is a SkyMiles partner as well. But when I search for award flights on Delta.com, the best option it has is to pay 45000 miles and connect in Guangzhou (CAN). One of the itineraries it proposes even contains a CAN-XMN leg on a Xiamen Air flight (CZ 354 + MF 8302). I've looked at both near and far dates--the entire grid of dates on Delta.com shows every available SIN-XMN itinerary costing the same and having one stop.
Is it possible to book flights on Xiamen Air using Delta SkyMiles? The Air France Flying Blue website says the SIN-XMN flight may cost just 21000 miles, but it also says that Delta miles can't be combined with Flying Blue miles (of which I have none).