Not really a newbie anymore, but this is a basic question -

I need to earn 20 more points in order to renew Silver, will be at DFW in November with access to many AA short (read "low cost") flight destinations. I can book on AA.com and credit to BA, or call BA to see if they can book, but which is the best/correct way? I'm thinking I need to book it as a BA flight for best earnings, right?