Originally Posted by hhdl

​​​​​​A comparatively small portion of actively flying Medallions are MM. Also note that non-MM who buys C+ gets the upgrade over MM who buys Main.

DM MM bought C+ (ordered by lifetime miles)
DM bought C+ (Reserve etc. tiebreaks)
DM MM bought Main (ordered by lifetime miles; 3MM lands no worse than here)
DM bought Main (Reserve etc.)
PM MM bought C+ (ordered by lifetime miles)
PM bought C+ (Reserve etc.)
PM MM bought Main (ordered by lifetime miles; 2MM lands no worse than here)
PM bought Main (Reserve etc.)
GM MM bought C+ (ordered by lifetime miles)
GM bought C+ (Reserve etc.)
GM MM bought Main (ordered by lifetime miles; 1MM lands no worse than here)

And so forth.

​​​​