I have a quick question - I'm going to book LONE3 travelling through US and Asia and back to Europe.
I'm going to ticket this through AA - but not sure which FF program to allocate to the booking. I'm BA gold, but also have an AA account with no status. Per my route I'm not going to be flying BA metal at all. 6 Flights on AA (inc Atlantic crossing), 1 JAL, 4CX, 1 Qantas.
I would want to use my BA status for lounge visits where possible, but looking at it, it doesn't make sense to accrue the miles there? I realise on L this won't necessarily make a massive difference, but just wondered what the most sensible choice was.

Thanks for any advice.