Annoying issues
It happens quite frequently that the app wont check you all the way when there is a connection. Instead you have to go to the skyclub and check in for the connection.
To make matters worse, when this happens, if you click boarding pass for connection it brings up an older boarding pass, not related to the current itinerary.
Delta does not provide any information for how to submit bug reports. Tried calling the number under "delta.com and app support" but they werent able to help and didnt know what a "bug report" is.
MartiniATL about
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