When you install the UPS shipping module, there are several codes that you must select to set your UPS shipping options.  See below for the definitions to this list.
1.   1DM         Next Day Air Early AM
2.   1DML       Next Day Air Early AM Letter
3.   1DA         Next Day Air
4.   1DAL        Next Day Air Letter
5.   1DP         Next Day Air Saver
6.   1DPL        Next Day Air Saver Letter
7.   2DM         2nd Day Air A.M.
8.   2DA         2nd Day Air
9.   2DML       2nd Day Air A.M. Letter
10. 2DAL        2nd Day Air Letter
11. 3DS         3 Day Select
12. GNDCOM   Ground Commercial
13. GNDRES    Ground Residential
14. GND         Ground
15. STD         Canada Standard
16. XPR         Worldwide Express
17. XDM        Worldwide Express Plus
18. XPRL        Worldwide Express Letter
19. XDML       Worldwide Express Plus Letter
20. XPD         Worldwide Expedited