Offer #1
Fly just three paid round-trip domestic flights or two paid round-trip international flights, and we’ll grant you Platinum Medallion status
http://dmn.delta.com/cgi-bin/ace_promo.cgi
Offer #2
Fly just two paid round-trip domestic flights or one paid round-trip international flight, and we’ll grant you Gold Medallion status.
http://dmn.delta.com/cgi-bin/ace_promo.cgi
Eligibility criteria: "Only members who receive this communication directly from Delta Air Lines are eligible to participate in this offer. This offer is non-transferable. This offer cannot be combined with other Delta/SkyTeam offers."