App keeps getting worse- There is little or no functionality to change flights in the event of delays or cancelations. Phone reservation staff (when you can get them at all) pushes you to the app. Ground staff does the same. It would be nice if the app actually functioned. Also, mobile boarding passes for seat changes (such as being upgraded to First/Business) won't load with the updated seat assignment no matter how many times you refresh. The worst travel app ever. Please fix.