A partially used ticket refers to an airline booking where some segments of the itinerary have been flown, but others remain unused. The most common example is a round-trip ticket where the passenger has completed the outbound flight but not the return. In the world of airline ticketing, this creates a complex situation regarding refunds and changes. Most non-refundable tickets have no "residual value" once the first segment is flown, meaning you cannot get cash back for the unused portion. If you need to change the remaining flight, the airline will "reprice" the entire journey based on current fares, often resulting in a significant cost difference plus a change fee. Furthermore, airlines strictly enforce sequential coupon usage; if you miss a middle segment of a multi-city "partially used" ticket, the system will automatically cancel all subsequent flights. This is a critical point for travelers to understand in 2026, as "skiplagging" or missing segments can lead to the total loss of the ticket's remaining value and potential penalties from the carrier's loyalty program.