Just to add one more person frustrated with this damn app. To start with, a calculator is not necessary when you can see at the time of purchase or reviewing you booking, just like UA. But if something like this is necessary, it is not something I want to so only on my mobile. The reservation is also on my mobile, so the amount of times I need to change apps to get it right is crazy. And when something goes wrong, it is almost a given I have to start over.