Most newer low-cost airlines that only sell directly to consumers (and not through agencies or Global distribution systems) do not support interlining at all.
Yield management usually makes purchase of new short-notice tickets in the event of a lost connection expensive.
The plating carrier collects the entire fare from the customer, either via own sales channels (e.g., web site or ticket office), or via travel agents.
Travel agents remit collected fares and taxes to the plating carrier via Airlines Reporting Corporation (ARC) in the US, or Billing and Settlement Plan (BSP) in the rest of the world.
There are some exceptions, such as if the first international is a codeshare flight, when the first non-codeshare would be used, or if an airline does not have an office in the country of origin.
During the 2010s, companies like Dohop (which collaborates with EasyJet) and the Czech travel agency Kiwi began to sell interlining tickets.
They purchase single segments on booking systems like Sabre and Amadeus, and re-package them with additional services, like reimbursed hotel costs in case of missed connections, vouchers to purchase another connecting flight, and phone helplines.