I like the APP.

One suggestion.

Add a screen displaying my SkyMiles Barcode so that I can use it at the Kiosk Scanners. Very handy to just scan the barcode right on the phone.

I currently use a different Android app that keeps all of my loyalty cards (CVS, Best Buy, Vitamin Shoppe, Delta, etc) and use them at checkouts.
The APP accepts DELTA's barcode and use it at the kiosk.

Thanks for the APP.