Most airlines run promotions several times a year, offering additional bonus miles with the purchase of a certain number of miles. (creditcards.com)
You can earn additional bonus miles through Alaska Airlines hotel and rental car partners and by shopping via the Alaska Airlines Mileage Plan shopping portal. (rewardexpert.com)
That means you keep that first 1,000 miles and you earn additional bonus miles through this limited - time offer (the exact amount depends on the total number of partners you qualify with). (travelcodex.com)