[max-privatevoid]

I encourage you to actually read the OP if you haven't, because I think it gives the most obvious example for that. That kind of app makes much more sense (for the user) to be a web app, especially when you don't intend to become a repeat customer.

[carlosjobim]

Yes, for the article example I completely agree that a travel itinerary should never be an app. But it shouldn't be a web page either. It should be a document saved on your device. So that you always have offline access to it when traveling.