Citi ThankYou Points → Turkish Airlines: 25% bonus

Citi is running a 25% transfer bonus to several airline partners this month, and Turkish-style partner charts remain some of the least expensive ways to book Star Alliance business class.

Because these charts price by distance rather than by carrier, a US–Europe business class seat can come in well under what the operating airline's own program would charge for the same flight.

As always with third-party partner charts: award space, not price, is the constraint. Check a calendar view across a wide date range rather than a single day.