* The ads must have been reviewed and approved. Please note that if you make any edits at all to an approved ad, then it must be reviewed & approved again before returning to AOL - or any other partner site for that matter.
* The ads must be in the appropriate position on Google, since not every AdWords ad is sent to AOL. At present, AOL shows the top four approved ads at the top of the page, and the next four approved ads at the bottom of the page.
If you feel that your ads are both reviewed/approved and in the appropriate position (this is on a keyword-by-keyword basis, btw), and they are not showing on AOL, then I'd suggest contacting AdWords support using the 'Contact Us' link at the bottom of every page of your account.
AWA