Originally Posted by
cxfan1960
My wife got a business to first milestone upgrade a few days ago. The check-in agent said that was for her 12th year anniversary... Why 12th year???

Other post seem to indicate it happens at least every other year after the 10th year....my wife's 11th year is coming up in May and we'll most likely be flying that week so I'll report back if she does get one this year