I'm flying Lax-Lhr next week business class on AA 136 then flying BA to Lhr-Dub. I booked the flights separately. Does anyone know if I can ask at Lax that my luggage goes through to Dublin without me having to retrieve at Lhr? Also can I be considered as a internal connecting passenger without having to actually go out of terminal 3 to get to terminal 5 myself? I'm hoping that as AA and BA are alliance partners and that I am flying business on both flights will help. Anyone? Thanks.