Similar to the Prestige Pack from Continental, it offers (4) space available upgrades and 5,000 bonus miles for $59.95. There are also other offers included in the pack such as ticket discounts and rental car offers.

From what I understand, it is a targeted mailing for new SkyMiles members after their first flight. That is how I got mine. I do not know of any promotion code or anything like that. I tried to pay for it over the phone and they told me that I had to mail in the application. Maybe you can request one.

Hope this helps.