Take a look at these two threads:
They're not guaranteed to be completely up to date, especially when it comes to newer properties, but they're a starting point.
Originally Posted by
Kremmen
I guess it is awesome hotel value, because TYP has very few hotel partners, but transferring them to an airline partner such as Singapore Airlines would easily give you >3c/TYP on business class flights.
Thanks IMH: I did a search for Lounge but guess I didn't look hard enough. Would be a good addition to the FAQ
Kremmen: You are totally correct, but I stay in a lot more hotels (100's of nights a year) than I fly long-haul biz class (2-3 times a year) so I'm working on optimizing hotels, which is harder than I would have thought! Fingers crossed for another 40% Avios Xfer bonus from Amex please!