Originally Posted by
JDiver
AA: Better service, food and especially ground support if things go wrong; lie flat but angled, not horizontal, seats. (AA 767s to / from Europe will all undergo conversion to lie flats, but that CIP has only just begun.)
IB: Better hard product (lie flat horizontal seats) and wine; utter cr@p on the ground, especially in case of any irregularity or disruption.
As American Airlines and US Airways are still operating as distinct airlines, this question is being moved to the appropriate pre-merger airline forum.
Please note the sticky at the top of the consolidated thread which is titled Welcome to the New American Airlines Forum! PLEASE READ BEFORE POSTING. With all of the changes about, it is important to know where to post, and reading that thread before posting (as the title suggests 
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~Moderator
Has AA changed their bird to the 763? I've flown this on a 752 international most recently last summer. Without look at the timetable, I think the 763 is used to BCN. As for the 752, it's what I call an 'almost' lie flat. From JFK, the IB flights are a 330 (early flight) and a 340 (later flight). The 340 in international business class was very similar to the 763 but I thought it felt more open. As for food, yo gosto comida de Espana, so I will say IMO the food is better on IB.