When I went through initial out here, we still did a pool day. Not sure when they stopped, but it's not a thing anymore.
We did our's towards the very end of our training footprint and for the week leading up to it my Sim partner (who had just gone through a bad breakup) was talking about how awesome it was going to be. The class before us had done a combined pool day with the new hire FA class going through and that's all he could talk about.
Fast forward to pool day, and it's just the three of us from my class huddling together in a pool in the pouring rain, glaring at my poor sim partner.