Actually, I was with a friend just last night and noticed that she had a delta icon on her iPhone "desktop"--as if it were an app. I had looked for a delta app through the app store and wasn't able to find anything, so I asked her how she got it. She said that her friend did it for her, so she didn't know.
I clicked the icon on her phone and it brought me to the new delta mobile website. So, I know that it can be done. The question is "how?"