There is a definite ramp up in the number of TS studs classing up in the C. You will class up in one model and fly that your entire time in TS. E2/C2 studs, for now, will continue to class up in the A. I have not heard anything to suggest a time frame for them to begin classing up in C's. My guess would be sometime after 100% of TS studs are Charlie students and they have no more Alpha's.