Originally Posted by
politico_pk
This was unfortunately my reason for posting...my understanding (though I stood to be corrected!) was that they had to be entered with your origin/destination/dates, rather than at checkout.
Have you tried booking it up as a multi-city trip directly on AC?
I have indeed, and AC is not allowing it.
For some reason, recently when I force Google flight to redirect me to AC, it’ll just go to the home page rather than the checkout page. Do you have similar experiences?