If you still want to get the double upgrade, try to get a KL Royal Wing brochure, printed in 2000 !!
In this brochure, they have a remark for Avis and Royal Wings:
Royal Wings
ouble Upgrade-Guaranteed.
Sometimes you have to fight for it, but I was able to get at least a two-class upgrade every time I rent/ or work out something nice, if a double upgrade was not available.
My Highlight was a 8 class upgrade at SEA for 3 bucks more a day.Chevy Metro-Cadillac DeVille !!
The AWD`s KLM quotes in their brochures are useless for German customers, way to expensive, very often no unlimited miles, no CDW included.
Call Avis and definately check their offers online, very often they have huge differences, I get better rates calling them.
Ask for the "Platinum" rate, normally the best rate from Germany, with everything important included !!
Ask the agent to put the remark: "Double Upgrade" in the "Bemerkungszeile" of the reservation, that should work out just fine !!
As quoted before, they reduced it to a regular upgrade in the US, but actually nobody knows or cares about it !!