A brand new feature from Miles&Smiles: Tax&Smiles The Miles&Smiles credit card owners can pay the taxes of the tickets that they purchased by their amassed miles, by using miles! So, they can travel without spending any money, just by using their amassed miles.
http://www.turkishairlines.com/tr-tr/kurumsal/haberler/20492/taxsmiles#.UVbin419xNY.email

Between 1 March – 30 April 2013, Miles&Smiles gives you extra 50% status mile in all domestic Business Class flights!