Delta MQMs refer to Medallion Qualification Miles, which are used to determine Medallion Status in Deltas frequent flyer program. MQMs are earned based on the distance flown and fare class, and are different from Delta SkyMiles, which are the rewards currency used to book award flights on Delta and its partners. MQMs are not redeemable and have no value for booking flights, but are essential for building Delta Medallion Status. To qualify for Medallion Status, a certain number of MQMs and Medallion Qualification Dollars (MQDs) must be earned within a calendar year. MQMs can be earned by flying with Delta and most partner airlines, and can also be earned through Delta credit cards that offer bonus MQMs when spending requirements are met.