The value of this to me would be breaking up a 12 ~ 16 hour flight into multi-day stopovers instead, so that any given flight leg isn't more than say 5 hours. I can spend a day or three somewhere before I'm ready to fly onward.
If you can build that as a feature I'd love to use it.
Initial impression is that the currency selection didn't work (changing between USD/EUR on the selector didn't change the currency being displayed in PLN)and I quickly lost interest due to lack of monetary context