Originally Posted by
JPG3392
You may also earn miles on Alaska or one of its partners for that flight.
To spell this out, not only will you earn miles on Continental as though you had flown IAH-ANC nonstop on CO ("original routing credit"), you can also earn frequent-flyer miles for the SEA-ANC nonstop you actually took on AS. Among the partners you can choose to receive miles for SEA-ANC: American Airlines AAdvantage, Delta Skymiles, and Alaska Mileage Plan. Choose one; collect your ~1500 miles; enjoy.
You will not be able to double-dip with CO -- you will earn credit for IAH-ANC but not IAH-SEA + IAH-ANC.