Now this is funny. I guess Delta does not want us to get a refund ever. Start here:

http://www.delta.com/traveling_check...nges/index.jsp

Click on the link:

http://www.delta.com/onlinerefunds/s.../OnlineRefunds

Refundable Tickets

You may change your ticket without paying a change fee provided all fare and ticket rules are met and seats are available. If you do not wish to reschedule your travel, you can apply for a refund.

Any you land on the page:

Requested Page Not Found