On Delta Air Lines, the "Z" fare code indicates a deeply discounted, non-refundable Business Class or Delta One ticket. In the airline's hierarchy of booking classes, Z is typically the lowest-priced revenue tier for the premium cabin. While a Z fare entitles you to the same physical seat, gourmet meals, and Sky Club access as a full-fare Business Class ticket (usually coded as J or C), it often carries much stricter restrictions regarding changes and cancellations. For example, a Z fare might have a higher change fee or might not be eligible for certain types of upgrades. For frequent flyers, Z fares are highly coveted because they allow you to enjoy the luxury of Delta One at a fraction of the standard price, but they often require booking far in advance or during specific promotional windows. In terms of SkyMiles earnings, Z fares generally earn a significant bonus (often 150-200% of miles flown), making them an excellent way to fast-track toward Medallion status while traveling in comfort.