This is well into a $3 6max tournie on Stars. On the flop turn, I don't feel I can stand a check-raise since AQ/AJ unlikely to be that confident to do this so I check back aiming to get more value on the river from weaker Aces and lower PPs. On the river I felt there were enough worse Ax hands in his range that he would not be able to get away from (given that if we give him all Ax hands possible we beat c. 67% of them), but does my raise only get calls from hands that we lose to? 

Poker Stars $3.00+$0.30 No Limit Hold'em Tournament – t350/t700 Blinds + t85 – 6 players
TournamentPokerEdge.com Hand History Converter

BTN: BB = 11.0, t7678
SB: BB = 35.2, t24642
BB: BB = 58.5, t40961
UTG: BB = 56.0, t39172
Hero (MP): BB = 59.3, t41538
CO: BB = 16.2, t11323

Pre Flop: (t1560) Hero is MP with A K
UTG raises to t1470, Hero raises to t3240, 4 folds, UTG calls t1770

Flop: (t8040) 4 7 A (2 players)
UTG checks, Hero bets t3500, UTG calls t3500

Turn: (t15040) T (2 players)
UTG checks, Hero checks

River: (t15040) A (2 players)
UTG bets t7820, Hero raises to t34713 all in, UTG calls t24527 all in