Booked family of 4 on LAX-LHR-BCN on 77W over Thanksgiving.
One aarp login worked for all 4 plus maxed out avios discount at 4x30K. 25K extra AA bonus makes is even better.
Interestingly MAD was not allowing avios copay but BCN was fine.
Unusually prices from the west coast are just as low as from the east coast...