Well, if you wanted to use AA miles for the DXB - BKK flight, there is currently VERY good availability in coach (which I assume is what you're looking for) on Etihad AUH - BKK on the direct (it is very easy to get from DXB to AUH for the flight). 22.5k AA miles. Could also spend Amex points for that, but would be almost 40k Amex.
Again, picking random dates, there seems to be very good availability on Cathay in coach BKK - HKG - NRT. That would set you back 20k AA miles.