automatically searches for Hertz car rentals first because they are a AAA Preferred Partner and offer AAA members a discount.
However, after you submit a search and get back only Hertz, you will see a link at the bottom of the screen asking if you want to SHOW NON-PREFERRED COMPANIES. Click that link to show all rental car agencies.

If you would like to search for all rental car companies that offers you should update your auto rental preferences in your account. Click here to go to your account auto rental area. Make sure the "Search all agencies" box is checked.