Originally Posted by
bitburgr
It's my understanding that FA's aren't allowed to do onboard upgrades so I think you might be left to the Y life rafts. But these days, you should really do yourself a favor and as with all things related to Y-class air travel -> bring your own.
They may not be able to do onboard upgrades, but maybe they can upgrade Y passengers to the first class life raft when they are outside the plane.