Join Date: May 2002
Location: Pittsburgh
Programs: MR LT Titanium, AA LT PLT, UA SLV, Avis PreferredPlus, HH Gold, Hertz PC, National Executive, etc.
Posts: 31,650
If it's a single ticket, my experience says yes. Or at least that you will be asked for it. I've never been in the position to say I don't have it but I will at my connection, so I'm not sure what would happen.
You could always call and ask.
(I'm making the huge leap in logic that "AAA" was a placeholder and you're not flying Anaa Airport to LAX, which would obviously require a passport)