Originally Posted by
udaipawar
...For example, I checked one/two AA routings via MIA, and that's only available in B and K. So now, I've no idea how to even do the first segment on the RTW

...Suggestions?
* fly to GRU
* go via MAD or BCN
* change your SA tour and fly to SCL first, or LIM, or EZE...
* ask BA to release an L seat for you.
Edit to add: I just checked availability for the exact date you want: BA/AA via MIA shows lots of L seats available, same thing for BA/IB via MAD. AA/AA via MIA is also available. And a ton of L seats available AA/AA via JFK. You are just not looking hard enough.