It appears as though American Airlines has started something by releasing their Android App last week. Now in the game is Delta Air Lines with their official Android App. It's currently available in the Android Market, or just scan the QR code below with your device.
The Delta Air Lines app, much like the AA app will allow customers to check in, download their boarding pass, check their flight's status, check their Sky Miles, see the current weather conditions and much, much more.
Read all about the app in the Android Market, install, and happy flying.