Delta Has an Invite-only Frequent Flier Status Called Delta 360 - Here's What You Need to Know About It
Briefly

Delta's frequent flier program features four tiers, Silver through Diamond, offering various benefits; the elite Delta 360 is invitation-only and provides unrivaled privileges.
'Delta 360 is an annual, invitation-only membership for our most loyal SkyMiles members.' While specific qualifications remain undisclosed, members enjoy top-tier treatment.
To achieve Medallion status, you simply need to meet a minimum threshold of Medallion Qualification Dollars (MQDs) instead of miles flown. This simplifies the qualification process.
With each tier of Medallion status, Delta provides increasingly attractive benefits, such as complimentary upgrades, waived fees, and higher earning potential for miles and credits.
Read at Travel + Leisure
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