The Delta Air Lines SkyMiles program rewards travelers with bonus miles for every dollar they spend on flights with Delta Air Lines. In addition to earning bonus miles, travelers can choose alternative rewards such as first-class upgrades, gift cards or donations to SkyWish charities.
The SkyMIles program features four tiered Medallion levels that offer additional benefits to travelers based on the number of miles they fly, according to Delta. SkyMiles never expire, and travelers can use a combination of miles and money to help preserve miles for planned trips. Travelers can redeem miles to any of Deltaﾒs 326 international destinations.