App is incredibly buggy and programmed very badly. When you check-in on the app and select the comfort plus upgrade it says it has checked you in but then you don't show on the upgrade list for C+, so either have to check-in again on the website or with a gate agent. Time zones don't work. When crossing the country app shows arriving hours late or early because it goes by departure time zone instead of arrival time zone. App looks at phone time for departure instead of location, that's insane.