There use to be a consistent loophole in CO's system. 5,244 EQMs which would yield 18,978 bonus miles to a Plat with the Chase double mile bonus (the extra 2K came from the co.com online booking bonus by making to tickets instead of one). $.0176 / EQM, $.0048 / bonus mile = Plat for only $1,320.

People posted this in the MR forum repeatedly and CO wised up and 'fixed' the problem. Moral of the story: if you don’t want to ruin a good deal -- don’t post it, PM it!

PS. channa was the one who showed me this