Closing cycle
Current app version using iOS 10 still has problems logging in. After logging into the app, it will cycle close within 3 seconds of viewing the app. In the phone background (as an open page) when you double click on your iPhone home button, you can see the app showing "logging in" but once it is selected, again, it will close within 3 seconds. The iPad version seems to work with no issues. I have the iPhone 6S, 32G. The fix that was issued last week failed.
T-Relle about
Fly Delta, v4.0.1