Originally Posted by
eponymous_coward
You can, however, buy miles on Alaska. There's even a promotional discount right now. That would be a way to "combine miles and dollars". Whether that is cost-efficient is up to you, since hundreds of dollars of BA fuel surcharges would be rolled into your cost.
That is true, *IF* you choose to fly BA on your Alaska miles. There's more than one way to get to London, with much lower charges. But you will have to deal with the usual limits on available seats. Depends a lot on how flexible your schedule is, and the number of seats you need.