The letters B,E,G,H,K,L,M,Q,S,T,U,V,W,Y (Economy Class), C,D,J,P,Z (Business Class) and A,F (First Class) are used to indicate the different price categories in the different service classes.

On Swiss International Air Lines (SWISS), Z class is a specific "fare bucket" for Discounted Business Class. It is a high-value option for travelers who want the full premium experience—including lie-flat beds, Michelin-starred cuisine, and lounge access—at a significantly lower price point than a fully flexible "J" or "C" class ticket. In the 2026 Miles & More loyalty program, Z class typically earns 150% of the miles flown, which is less than the 200% earned by higher-tier business fares but still quite generous compared to economy. It is a peer-to-peer essential to know that Z class tickets are usually non-refundable or carry high change fees, making them ideal for leisure travelers with fixed dates but less suitable for business travelers who need last-minute flexibility. Despite the lower price, you still receive the "SWISS Business" high-standard service, including priority check-in, two 32kg checked bags, and the signature Swiss chocolates, ensuring you arrive at your destination in total comfort without paying the "full-fare" premium.