Blinds are 200/800/1600 Hero has 24,000 in the BB

3rd to act makes it 3300 (150K behind), button calls (50K behind), SB makes it 10,500 (175K) and Hero in the BB has AKos...what is the correct play here?

SB is Loose - and the initial raiser is tight. This is day 1 of a 3 day tourney

Thanks!

go all in.

you have 15bb and big antes

Yeah, great spot. If SB is loose he could be squeezing wide with his big stack, so you're ahead of his range. And the initial raiser, though tight, can only call with the absolute best of his range with SB still to act.

never folding AK with <20bb

I came back to edit my own post with a disclaimer. While I've played poker for years, I took nearly a 7 year hiatus, so take any advice I give with a grain of salt . However, despite that I...

...agree with previous posters. Shove. You have 15BB and one more round around the table if it's 9-handed will cost you 4,200 with the antes/SB/BB. Two big stacks in there. Your 4bet will probably not get the SB to fold anyway. You said initial raiser is pretty tight and 3rd to act I assume would be middle position so he probably has a pair in the hole or a big Ace.

Calling 10,500 which is pretty much half your stack here doesn't give you much room to make moves on the flop against stacks 6-8 times your size. On the flop with big slick here with your stack you're either shoving all in anyway or folding regardless of what hits. I can't see folding here as being profitable as chances are you won't get a better spot/hand.

Shove all in and you most likely will be up against only the SB and probably ahead.

have to get it in there with AK

Shove shove shove