Allows you to display additional upsells for the journeys. The system cannot request upsells explicitly; the system can only do something with them if provided by the carrier.
By default, the system does a low fare search, so only the lowest fare is presented.
With this element, you can tell the system “if the carrier returns upsells, return them as additional fares, but no more than X.”
Maximum number of NDC upsells per itinerary.