So far so good.
After booking a flight via Expedia, I decided to check see if Delta had an App. I ended up learning about their SkyMiles program, signed up and now Ill be earning points for my flight! I can also use the app to easily generate my Itinerary and add it to my Calendar. Hopefully theyre update with Passbook support so I can save my boarding pass there.
JonCruise about
Fly Delta, v1.7.3