Delta Airlines is a major United States airline, with its headquarters and largest hub at Hartsfield-Jackson Atlanta International Airport. The airline, along with its subsidiaries and regional affiliates, operates over 5,400 flights daily and serves an extensive domestic and international network that includes 319 destinations in 54 countries on six continents. Delta is also one of the founding members of the SkyTeam airline alliance.
SkyMiles is the frequent flyer programme of Delta Airlines and one of the key feature of SkyMiles is that the miles never expire and lasts for a lifetime. SkyMiles has 4 different levels of membership: Silver, Gold, Platinum and Diamond, and registration is free.
To join Delta's SkyMiles, you can simply register online here.