Thanks gemac!

I kind of figured that getting a free trip once every one-two years was too optimistic, but what about upgrades? I've been unable to "penetrate" the system of upgrades (on top of the different programs and credit card systems...), so will it be realistic to imagine getting upgrades from economy class to business class with 15-20,000 miles accrued?

I know my wife would be really pleased if we could get a trip to Europe on business class having only "paid" for economy.

Thanks for your help,
Knaldskalle