Last week, I faxed in a polite letter, as well as a copy of both sides of my AirTran Elite card to the Delta Skymiles service center. I did not send in any other documentation. I checked the Delta website yesterday and saw that I got comped to Silver. ^

As a sidenote, I had already flown with them 6 times this year and have 2 other flights already booked and made sure to point that out in my letter.

And btw, I love this site! A few weeks ago "Status Comp" wasn't even in my vocabulary