A9o - Late in tourney

[shant]

I'm fairly new to multi-table tourneys, I play mostly limit ring games, but I'm really enjoying learning about tourney play. I played the Empire $5000 tourney tonight for $20+2. I made the money and there were 22 people left.

Blinds 300/600 - I have around 5900 in the SB, BB is in the top 5 with 23K+. Average stack at the time was about 8600.

I have A9o and it's folded to me. I push.

Thoughts?