Install the US Airways Dividend Miles search toolbar and get 500 points. You get an additional 500 if you are a Preferred member or have a US Airways Mastercard. Additionally, you get an additional mile for every 3 searches you make. These toolbars offer free miles for stuff you already do and if you don’t want it, just uninstall it after you’ve completed a couple searches and your bonus miles post.
Here’s a link for the American Airlines search bar.
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