<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by UserSchmoozer:
If I'm only interested in AA miles, though, would I be correct in stating that it would now behoove me to transfer Diners points to BA miles, at which time these could be used to book travel on AA?
What am I missing out on here, if anything? Are there other factors I ought to take into account?</font>
If you transfer your DC points in to BA miles, you can certainly use them to claim an award on AA, with the exception for travel on AA transatlantic routes.
You cannot however convert your DC points into BA miles and then convert them into AA miles.