I have a QR booking for later this year, out in economy and back in business. I'm planning on switching to BA Executive Club this year due to the new EQD requirement. Would I be right in thinking it's fine to add my AA number to the QR booking initially, to secure better seats, priority boarding and lounge access for the economy outward, then at check-in for the business return, ask the agent to switch to my brand new BA number, since my flown cabin will give me the same benefits? I'm not fussed about losing the BA tier points for the outward as I'll easily make OWS with the business class flights I have booked later in the year.