We just posted on the new Alaska MileagePlan shopping portal bonus yesterday. Remember when I said, and I quote:
In the past, the other airline shopping portals follow suit. Oh how we love competition… Here’s hoping Southwest, United, Delta, and American offer summer promotions soon as well!
Well, looks like United heard me! (Or maybe I just missed the email from United MileagePlus Shopping the first time.) Right now, earn up to 1,000 bonus United MileagePlus miles when using their shopping portal. You’ll need to make purchases through the portal before June 26th, so there’s not a whole lot of time to take advantage of this offer. The terms say you should allow 10 weeks for the bonus miles to post, but that hasn’t been my experience in the past. Usually it’s much faster.
Since the backends to these portals are all the same, the terms and conditions are almost identical:
For what it’s worth, I did double check the Southwest Rapid Rewards portal, Delta SkyMiles Shopping, and American Airlines eShopping. Nothing so far.
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Dan Miller travels with his wife and 6 (SIX!) children. He loves to help families travel for free / cheap, especially larger families. If you are looking for help, drop him an email at 
Alaska has one as well I believe. 500 for $200 through 6/26 I think. They usually follow the big boys as well.
@DaninMCI – did you even read the article? The title and first section directly reference the Alaska portal offer.