AKs, big pot and I miss

[brettbrettr]

10/20 game, pretty good game.

I have A [img]/images/graemlins/club.gif[/img]K [img]/images/graemlins/club.gif[/img] in MP and raise.

MP1 three-bets, three callers, I cap, call call.

5 to the flop for 16 sbs.

5 [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/club.gif[/img]4 [img]/images/graemlins/heart.gif[/img]\

Checked to me and I check. MP (pretty tight weak) bets, two callers, the BB (lagtard) check-raises, I'm fairly certain the tight weak player behind me has a big pair, TT-AA. She'd more than likely three bet KK or AA, call with the others. Plan?