Originally Posted by ISTFlyer

Welcome to FT,
- TAV Passport is not valid, there is a new program IGA Pass which I've shared information at the Istanbul Airport Master Thread. You could find that thread in the Europe section.
- If you hold Elite & Elite Plus you would be admitted free to the Miles&Smiles Lounge while flying Economy. There would be an IGA Lounge which one time entry is 59€ ( 50€ + %18 KDV ) and IGA Pass members would be able to use the lounge for free.