How do I create an IPO?

I am stuck! I have read the wiki and all that but I still have no idea for how to create an IPO for my airline that has already been running. How do I do this??

Finance -> Stock exchange (the last entry)

But your company needs to be at least two weeks old and an A or better raiting.

youre airline also has to be a subsidy of a holding company - it can’t be the holding company. This is often something that new users (I know a handful) overlook when they start (as I did) as a feature they will look into once they get the to grips of the game, and then realise they can’t. Having said that, I am not at all against the model - just mentioning it here for information.

ohhh, okay thanks!