Originally Posted by invstbiker
Thank you, I've checked this out however neither Northwest or Delta show a conversion to BA, so I guess it doesnt exist.
I'm sorry to say but I don't think you would be able to transfer your NW miles to BA. Since I have excess miles sitting in Worldperks, I tried doing this recently and eventually gave up. So now it's either build miles on BA or fly a bit more NW and try and use them.