[Nick C]

The 3-bet from the BB indicates a probable big hand.

Here are some combos on the turn:

AA = 6
KK = 1
TT = 3
99 = 3
AK = 8

QQ = 3
JJ = 6
AQ = 12

So that looks okay, except that I really doubt BB is pulling a stop-n-go on the turn with AQ, so I think that should be discounted heavily. (Also, a lot of players won't 3-bet AQ preflop from the BB.)

Maybe 99 should be discounted too, though. I just threw it in there because I'm not sure what SB is doing with the turn stop-n-go. Maybe in fact SB is betting because his JJ picked up a gutshot? Maybe he planned to checkraise with TT but got scared someone has QJ when the turn card fell? Maybe he's just not the type to 3-bet with a hand like AK on the flop and prefers the stop-n-go?

Anyway, getting 3-bet on the turn would suck (and I think you have to call with your gutshot, which should be clean if BB can 3-bet the turn, unless BB was 3-betting QJ preflop). Also, I don't think you have any real folding equity. So I would probably just call, planning to call again on the river. (If a jack fell on the river I'd raise.)