text: what are the different playing levels in baseball? i was wondering what the progression was from  a person in the minors up to the majoe league. you hear about aaa, aa, a and i was wondering so that i might be able to keep track of prospects for my fantasy team, ie; which ones are the closest to being called up to the majors aaa is the one you want.  there are a lot of transactions between the big league and aaa.  aaa players are usually veterans.  only few of them are rookies.  aa and a contain more rookies.  that's why they promote people from aaa first, because generally if you can survive in aaa, you have been tested by other veterans.