Delta Air Lines and Starwood Hotels & Resorts Worldwide are partnering on a "crossover" loyalty program

in which elite-level travelers simultaneously receive benefits and earn points across both companies' programs, effective March 1. Delta SkyMiles Diamond and Platinum Medallion members are eligible for such Starwood Preferred Guest benefits as late checkout and free in-room Internet access. SPG Platinum members in turn get such benefits as a free checked bag and priority check-in and boarding for Delta flights. Additionally, Delta Medallion members earn a mile per dollar on room rates from Starwood, and SPG elite members earn Starpoints from eligible airfares with Delta.