This is an old thread, but I'm thinking about a future trip to Europe and wanted to strategize about the best mileage deal. Normally, I would pick the cheapest fare among CO, NW, BA, and AA, and accumulate the miles on AS (assuming the connection is acceptable). However, BA only gives 25% mileage credit on discounted economy fares.
If I value the miles at 2 cents each, and my trip is, say, 12,000 miles, wouldn't that mean I would be willing to pay up $240 extra for a flight on CO, NW, or AA (or perhaps BA at full fare), over getting a BA discounted fare? Of course, this assumes that the company isn't paying the bill... Any corrections to my math?