Air Serbia will upgrade its systems for passenger sales and check-in this weekend, which will cause some planned interruptions to normal services provided by the airline. The new system will improve Air Serbia’s service capability in a number of areas, including its website, bookings process, and check-in procedures. All flights and airport check-in counters will operate as normal and the system upgrade will in no way impact the on flight operations. However, on Saturday April 22 purchasing tickets and bookings (online, through the call centre or travel agents) will be unavailable. Furthermore, passengers will be unable to check-in online or change or cancel a booking. These services will resume on Saturday evening. Air Serbia has described the upgrade as a "step change" in its business. By migrating to Sabre’s software, the carrier will be able to streamline daily operations, reduce operating costs, strengthen revenue generation and retailing, and drive more ancillary revenue opportunities, enabling it to provide passengers with a more personalised service.