For the parts of a trip that can be structured, sequencing days, surfacing options, building a sensible route, AI already plans at least as well as most agents, and in seconds rather than days. Where an experienced human still earns their fee is the intangibles: which neighbourhood suits your temperament, which table is worth the detour, when a famous sight is not worth the queue. The honest answer is that AI plans the trip; taste finishes it.
What AI does brilliantly
Speed and breadth. Describe your dates, your pace, and what you care about, and a good assistant will return a coherent day-by-day plan with real places, grouped so you are not crossing the city twice. It is tireless with revisions, patient with "make day two calmer," and it never pushes a hotel because of a commission. For a first draft, it is hard to beat.
Where human judgement still matters
A plan is only as good as its taste, and taste is where people still have the edge. The right pace for a slow morning in Lisbon, the difference between a street that photographs well and one that feels alive, the small reorderings that turn a full day into an easy one. This is judgement, and it is worth seeking out, whether from a person you trust or a source you rely on.
The part everyone forgets: keeping the plan
Here is the real weakness, and it is not about intelligence. A brilliant AI itinerary is useless the moment it is trapped in a chat you will never scroll back to. You cannot see it on a map, hand it to the person you are travelling with, or follow it on a street corner. This is the gap Tralendr closes. Plan with AI in ChatGPT, Claude, or Gemini, and the trip is saved as a real, visual, day-by-day itinerary you can edit and share.
So, can AI plan as well as an agent?
For most leisure trips, yes, provided you add a layer of taste and keep the plan somewhere built for travel. You get the structure of a planner at the speed of a search, and a plan that becomes a usable itinerary rather than a wall of text. Plan it free, and keep it all in one place.