Status Privileges when using partner airlines
 

I am a Gold Member with American AAdvantage. which is Ruby on Oneworld.

Organizing a new trans Atlantic trip from Miami to London I have booked a BA flight with BA.com and linked in my AA mileage account to the booking to get miles.

As a Gold AA member flying American I get Priority access and early boarding when booked into coach / economy tickets.

My question is do I get to use these or similar privileges for my World Traveller trip to London with BA ?

With Gold on AA you will Business Check-in, but I believe Priority Boarding is Sapphire/Emerald only.

Great. Check-in is good.

So if I get this correctly I can check-in at the business class area of BA at the airport.

I have two companions also on the ticket (no tier status for them). Will they be able to join me ?

That should be possible.

A brief overview of what Oneworld status gets you is here

http://www.oneworld.com/ow/ffp/oneworld-status

Priority checkin is a benefit for Ruby, but boarding isn't. There's nothing published about how many accompanying pax can take advantage of checkin benefits, but 2 should be ok.

My FFP expressly states that for Ruby you can only check yourself in at a premium counter but for Sapphire you can check with an "acompañante" (companion)

That is their supposed interpretation of the OW benefits for elites

As brenc3 says though, OW doesn't mention anything about additional people

So you fly with your partner with no status and they're gonna say, sorry you check in here, they can check over there.. I don't think the check-in agents really care about one extra person checking in... unless of course it's someone travelling alone without any status. We as a family have checked in together many times at business or first check-in desks when only one or two of us has had status.

This is of course based on my experiences and opinions but I do not know how it is said in the rules. I think you should be fine.

The biggest problem with Ruby status is that BA doesn't have similar level !

Surely that is only a problem for BAEC members that would have got low tier elite status were they members of other OW FFPs

Universal OW Ruby benefits only seem to be premium check in and priority luggage tags so I don't see how BA's lack of Ruby tier would affect Ruby members from other OW airlines

priority luggage isn't an official ow tier status benefit

I suspect that will change very shortly. BA and IBs programmed set to be harmonised in November. IB has Ruby so it makes sense for it to be introduced on BA.