In the complex world of airline revenue management, Delta Class T is a specific fare basis code that belongs to the Main Cabin (Economy) category. It is classified as a "Deeply Discounted" or "Promotional" fare class. While the physical seat you occupy is a standard Main Cabin seat, the "T" designation determines the rules and rewards associated with your ticket. For example, Class T tickets are often non-refundable and carry higher fees for changes compared to more expensive Y or B economy classes. From a frequent flyer perspective, Class T historically earned fewer "Medallion Qualification Miles" (MQMs) or points compared to full-fare tickets, although Delta's shift to a spend-based model in 2024 and 2026 has changed how these are calculated. If you see "T" on your boarding pass, it simply means you likely secured a very good deal on your ticket during a sale or by booking well in advance. It is important to note that Class T is still eligible for upgrades to Comfort+ or First Class, unlike Basic Economy (Class E), making it a favorite for savvy travelers looking for a balance between low cost and the potential for a better seat.