The code "HCOK" (or sometimes seen as "HK") on an airline boarding pass is an internal status indicator that stands for "Holding Confirmed." Essentially, it is a technical confirmation that your seat has been successfully carved out of the airline's inventory and is officially reserved for you. In 2026, you are most likely to see this code if you have a printed "Internal Travel Document" or if you are viewing the "Full Receipt" of an e-ticket rather than the standard mobile QR code. It serves as an assurance that there are no "pending" status issues with your payment or segment. If you see "HL" (Holding List) instead, you are on a waitlist. While most modern passenger-facing boarding passes use simpler language like "Seat Assigned" or "Zone 3," the "HCOK" designation remains a vital piece of data for gate agents and customer service representatives to verify that your transaction is legally and technically finalized for travel.