Redeemed one-way award in business class for TXL - IST.
Turkish Airlines had no availability, so asked Aegean to check Lufthansa Group airlines.
Managed to redeem for TXL-FRA-IST for 21K miles and 150 euro fee. Not exactly a particularly efficient use of miles, but was significantly better than buying the ticket outright.
Service was great, didn't take any time at all to make the booking.