- Two years ago, I had several domestic BA flights, on which I presented an AA card, posted to both BA and AA. (The BA were automatic, and the AA were mailed in.)
- Before Euro members were unceremoniously kicked out of NorthWest a couple of years back, I used NW miles to book a free KLM transatlantic trip, and actually earned NW points on this trip! And then, when NW transferred my points to KLM Flying Dutchman, they boobed and transferred them twice. I ended up with enough points for another free KLM trip! [Incidentally, Flying Dutchman has to be about the meanest program I've come across. Consequence: NorthWest has not had my business for two years.]