Is limp/calling with AA a reasonable approach?

[betgo]

In this forum, people tend to say raise initially with big pairs, and definately reraise if you limp, but I see people limp/calling with AA a lot. Is this a bad play.

This hand is from a $100 MTT, and villain is Ronenon, who appears to be sort of a regular.

I was sort of suspicious of the UTG limp from this player, but it was hard to limp behind with JJ. The river bet looked like a value bet, and I thought maybe I shouldn't have called.

PokerStars No-Limit Hold'em Tourney, Big Blind is t150 (9 handed) internettexasholdem.com

MP1 (t2784)
MP2 (t5473)
Hero (t5900)
CO (t10910)
Button (t3355)
SB (t5344)
BB (t1995)
UTG (t8035)
UTG+1 (t5104)

Preflop: Hero is MP3 with J[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/club.gif[/img].
UTG calls t150, UTG+1 calls t150, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t750</font>, <font color="#666666">4 folds</font>, UTG calls t600, UTG+1 folds.

Flop: (t1875) K[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, Hero checks.

Turn: (t1875) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets t750</font>, Hero calls t750.

River: (t3375) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets t1500</font>, Hero calls t1500.

Final Pot: t6375

Results in white below: <font color="#FFFFFF">
UTG has Ad Ac (one pair, aces).
Hero has Js Jc (one pair, jacks).
Outcome: UTG wins t6375. </font>