Delta Air Lines has updated the Delta iPhone app and added new features, including the ability to view, select and change seat assignments. When you check in, you can launch an interactive seat map and choose or change your seat. Medallion members can now use the app to view the airport upgrade list and if you are flying standby, you can access the standby list. The app also allows members to access their SkyMiles account information, check in and request an eBoarding Pass and view updated flight status and gate information, along with other features.