I just wandered in here because I've been looking at the JK program the last couple of days. I fly them all the time, but always put my points on LH. You can get *G in eight RT flights MAD-ARN, on Z fares, which can be as low as 150EUR (or so I hear). That's 1200EUR for *G, and you do it all in business.

I can think of worse ways to get there!

The other bonus I just ran across is that I can convert my "la Caixa" points 1:1 into JK+ points! Finally I can do something useful with those, besides order crap from a catalog.