No, you do not keep Delta Medallion status forever; it is an annual achievement that must be "re-earned" during each calendar year. In 2026, status is determined solely by Medallion Qualification Dollars (MQDs)—a measure of how much you spend with Delta and its partners. Once you reach a tier (Silver, Gold, Platinum, or Diamond), you enjoy those benefits for the remainder of the year in which you earned them and through the following "Medallion Year" (which typically ends January 31st of the year after). If you do not meet the MQD spending thresholds in the subsequent year, your status will "downgrade" or expire. The only exception is Million Miler Status; if you fly 1 million, 2 million, or more "Lifetime Miles" on Delta-operated flights, you are granted a specific Medallion tier for life (e.g., 1 Million Milers receive annual Silver Medallion status permanently). For everyone else, 2026 remains a "what have you spent lately" system, requiring consistent travel or credit card spend to maintain those coveted elite benefits year after year.