There has been plenty of discussion on other forums as to whether AA (or in fact, other USA airlines) ask passengers to confirm that they comply with OFAC requirements when booking a one-way trip from Cuba to USA.
So, I went on to AA’s website and pretended to be an Australian, Bruce C. Dundee, and did a dummy booking. Below is a screenshot of the window that came up:
It seems if you click on the Start Over button, you get nowhere, and can’t complete a booking. As per the instructions, when you click the Continue button, you agree that you comply with one of the categories.
I am told that if you are not a US citizen, and are flying one-way from Cuba to USA you don’t have to do this, and there is a way around it. So far I have not found out how to do that.