Originally Posted by Kmxu

I guess that [MENTION=98678]trm2[/MENTION] might refer to miles and copay upgrade to a business class ticket from a paid economy/premium economy ticket. United does allow one to purchase miles using cash when buying a mileage ticket and you have insufficient amount of miles. This is treated as a mileage ticket and therefore not be counted toward MM status. I am not aware of any other purchase of UA tickets paid partially with miles and cash.