Applied on Detla Status Match Challenge. Although Turkish Airline is not listed, but Delta still offer the challenge to Gold only within 3 months. 12,500 MQMs or 15MQSs + $2000 MQD or MQF Waiver. Since i'm not in the USA, so i only need to qualify the first criteria. But interestingly, some of the skyteam partner, even the business class only accumulate 100% mileage without extra bonus. Really need to find right airline to complete this challenge task.