One of my previous ones did, but only for European travel. Transatlantic it was AA because of a global policy. On my Asia/Pacific travels, it was open to whoever I wanted, and I started out with Qantas, but once BA brought in the flat beds in Club World, I shifted most of my flights to BA. I say most because I enjoyed Qantas' meals more, so I'd start a flight out of Australia on QF and switch to BA for the overnight to London.