I have just purchased a UA ticket on united.ca to be able to get E+ seats (at a price of course). In doing so, the Secure Flight information required is just name and DOB, nothing else (Passport #, address in US) - nada.

This is so different from AC, that I called in to US web support, and they confirmed this was correct. I have actually taken screenshots for the record I am so gobsmacked. What gives? Why does AC require more information?