Airlines use a highly sophisticated system called Revenue Management (or Yield Management), driven by real-time dynamic pricing algorithms. Instead of a fixed price, a single flight is divided into "fare buckets" (classes like Y, B, M, etc.). As the cheaper buckets sell out, the price automatically jumps to the next level. In 2026, these systems are more advanced than ever, factoring in historical data, competitor prices, and current demand elasticity. Prices fluctuate based on the "booking curve"—business travelers tend to book late and are less price-sensitive, so prices often skyrocket in the final 14 days before departure. Conversely, leisure travelers book early, so airlines offer lower fares months in advance to ensure a "base load" of passengers. Additionally, "ancillary revenue" (fees for bags, seats, and WiFi) allows airlines to keep base fares low while recouping costs through optional add-ons. Weather events, major concerts (the "Eras Tour" effect), and fuel price volatility are all fed into the algorithm to adjust thousands of ticket prices every second.