yabones parent
It's funny, because it's also one of the most "gotcha-filled" things you can do. Click the wrong box, and they'll stick you in a seat with no leg room or make you pay extra for a carry-on bag. I have very little confidence that an AI would be able to make the "correct" choice on an airline ticket consistently without making a rather impactful mistake.
It will work for a while and then the airlines will game their systems against AI agents just like they currently do against consumers.
It's just a temporary solution. A real solution would be for laws to force them to not do this. But airlines are often very intertwined with the state and a prestige thing for a country.