Do I need a separate Mileage Plus account to earn award miles from participating online retailers in Mileage Plus Shopping or from retail stores or catalogs?
No, as long as you sign in with your Mileage Plus number, all award miles earned from shopping with participating retailers in Mileage Plus Shopping will be credited to your Mileage Plus account. On your ‘My Statement’ page within the Mileage Plus Shopping mall you will only see the award miles you’ve earned for shopping with Mileage Plus Shopping.