[From Hans] If you fly Delta and have an Android phone then you'll want to know, "Delta Air Lines' Fly Delta Android app has long been one of the first things I install on a phone. It's well-designed, and has added a couple killer features since its release nearly a year ago -- mainly the ability to view upgrade/standby lists and check and change seats from your phone, and more recently they added the ability to track your checked baggage. Good stuff.
And now Delta's added even more functionality in Version 1.7. Here's the full changelog.
Check in for flights arriving or departing international locations
Discover Delta’s valued partners within the "Traveling with Us" section
Support for Android 4.0 (Ice Cream Sandwhich) [sic]
Fixes for many of the bugs reported by our customers, along with several speed enhancements"