Married segment

A married segment is a pricing and inventory control rule used in airline reservation systems to manage seat availability in all connected flight legs. It links two or more flight segments together, meaning that seats are only sold on the full itinerary, not on the individual legs separately.

For example, an airline may offer a trip from Paris to New York with a connecting flight in London. If those two segments are “married,” the system will allow the seats to be booked only as a Paris–New York journey, not as standalone seats from Paris to London or London to New York. 

Once segments are married, they behave as a single unit in the system. They cannot be “divorced,” meaning travel agents and passengers cannot split them up or modify one segment without affecting the other. Any changes—such as moving, rebooking, or canceling—must be applied to all the linked segments.