Consumer AI trip planners are good at sketching a trip and bad at the details that matter on the day: whether the museum opens on a Monday, whether the train arrives before the transfer leaves, what the room costs this week. They have no inventory, so every suggestion is a guess the traveller has to check.
An itinerary agent for an operator or agency works the other way round. It can only propose products the company sells or can source: its own tours, contracted hotels, transfers, and live results from supplier APIs such as a GDS, an NDC feed or a bedbank. Every line in the itinerary carries where the price came from and when it was checked, so the consultant can stand behind it.