The remaining four categories, as well as Membership Rewards travel center purchases, earn double points. (rewardexpert.com)
If that's not enough flexibility, you can purchase some or all of your air travel directly from the Membership Rewards online travel center. (rewardexpert.com)
But the new work shows that in the first 10 days of an epidemic, other travel centers might be the spreading hot spots. (scientificamerican.com)