Flexibility is the advantage. In a chat interface, you can type literally whatever you want and ChatGPT will do its best to serve you. In a website like Skyscanner, you are inherently limited by their UI design.
If all you want is the cheapest flight on a specific day, Skyscanner is really great. But what if you need to book a bus at the other end of your flight? Skyscanner is not going to help you with that, but ChatGPT might! It could search up different bus providers in your destination and cross-reference them against the available flights.
How much you trust ChatGPT to actually do this well is up to you. But I suspect a lot of people will trust it, and I would probably be willing to use it for low-stakes tasks at least.
I would argue Skyscanner or whatever other company is better in offering additional services (hotels, taxis, buses) than ChatGPT, because it’s specialized.
I think if you really exactly know what you want the input in AI might be faster "book me on the flight tomorrow at 1pm from x to y on airline xyz -y" This I could imagine being faster, but it would still require verification by me to actually pay. I wonder if AI is faster in doing that given the added latency compared to me visiting airline xyz and doing the search manually (even perceive loading time taking in consideration) as it will be perceived less time if you are active.
If all you want is the cheapest flight on a specific day, Skyscanner is really great. But what if you need to book a bus at the other end of your flight? Skyscanner is not going to help you with that, but ChatGPT might! It could search up different bus providers in your destination and cross-reference them against the available flights.
How much you trust ChatGPT to actually do this well is up to you. But I suspect a lot of people will trust it, and I would probably be willing to use it for low-stakes tasks at least.