I just spoke with an AZ agent regarding my seat selection, he happily helped me to select my preferred seats, I asked him if everything looked fine and he said '' Everything is good sir welcome aboard''.
Honestly, I doubt anything will happen beyond this point, everything looks good I even received my seat selection confirmation from AZ with my ticket number stating Business class.
As
Oxymore mentioned above don't forget your Esta/Visa and all the right documents.
All of you guys who have not booked position flights yet should as the ticket prices will increase if you keep waiting until last minute.