It seems now we can't transfer points to AA/Hyatt or other international airlines from HDFC Diners Black card
They have also reduced the redemption on Jet Airways/Air India.
Redeem Reward Point for AirMiles across Jet Airways (JPMiles), Air India (Air India Miles) or Singapore Airlines (KrisFlyer Miles). 1 Reward Point = 0.70 AirMile.
http://hdfcbankdinersclub.com/diners-club-black