Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,186
Are you actually wanting to depart IST? If not, TK married segment logic means that far more award seats are made available for connecting routes.
"Almost every seat in business class is open" is also usually an incorrect interpretation of your source information.