[jonas21]

It's also a marketing channel for future flights. The app almost certainly asks for notification permissions, and most people will say yes -- they're useful for knowing if your flight is delayed or there's a gate change.

Now they have a channel where they can let you know about deals, etc. I'm sure they've modeled exactly how much this is worth, and I'd be willing to bet it's a lot.

[baxtr]

Re notifications: I have seen important apps not working unless you allow notifications.

This might be the case here as well.

You wanna fly? Allow notifications!

[lxgr]

Isn't that against App Store guidelines? (Not that Apple could afford to kick out Ryanair, but I think they have other options, such as blocking updates until it's been remedied etc.)