Geez, can we go two weeks without this subject coming up again and again and again? Use the search function people, it will answer a lot of your questions.
The 737-800 is a replacement for the 727, not the DC-10. When the DC-10's are retired, Sun Country will be an all 737-800 operator. It is not the company's intention to replace the DC-10's.
A noble spirit embiggens the smallest man...