Boarding Passes App Design

We want to build a new app that allows users to display their boarding passes for upcoming flights. Our new app will work for all airlines, so users won’t need to install the app of each airline, or deal with websites that are not optimized for mobile any more!
The app is not targeted at business travelers with many flights, but the average person that goes on only a handful of flights each year and is confused by the complexity of the current check-in processes.