% chance for AA: 0.45% (1:221)
% chance for someone to get AA in 9-handed: 4.0% (1:25)
% chance for to get KK,QQ, or JJ with AA removed: 1.4% (1:73.6)
% chance for KK,QQ, or JJ for one of 8 remaining players: 10.4% (1:9.6)
% chance for AA and (KK,QQ, or JJ) in 9-handed: 4.1% (1:241)
This means you'll see AA vs KK,QQ, or JJ once every 241 hands, but if you have AA, you'll only face one of these hands 10.4% of the time.