Also which platform are you using to book the ticket if you’re not able to reach the credit card payment page?
I’ve found this stupid, and it does seem very stupid, bug on the AI website where you cannot use “desktop mode” on any (Safari & FF) iPad browser to book tickets - you’ll get a “multiple window error” message. Changing Safari or FF to “mobile mode” shows you the exact same screens that desktop mode would and works without issue.
Also seems like AI now is more accepting of foreign CCs and are offering dynamic currency conversion to take advantage of customers right of the bat.