2001 KLM offered a status match AND a mileage balance match to woo folks from the just defunct Sabena program...but they did not put any conditions on the match (ie- having to be a Sabena member). To match 100% of the miles in my existing account, I had to fly 8 KLM or NW segments, which I had already booked for pre-existing travel anyway, valued at $1100.

I submitted my UA account which had 2.8 million miles and it was matched. About a year or so later, KL decided to equalize the point values of its program and NW WorldPerks program. They decided to offer KL members 1.8 miles per KL mile for the 'equalization. So, my KL balance was revised in mid-2003 to 4.6 million.

And there you have it!