Recently,
some international business class award space between Australia and Singapore has been available to partners for award bookings.
In any case, it appears that Delta devalued most of
its international business class awards this year.
When award space is availble, it's not too difficult to find an economy class award ticket for 25,000 miles instead of paying $ 500 (valuing miles at 2 cents each), or
an international business class award ticket for 120,000 miles instead of $ 6,000 (valuing miles at 5 cents each).