I'm sure internal letters help for those that have them. I like you had no internal letters and got the e-mail about 6 weeks after applying.

For those wanting to know what they look for I can't tell you for sure. I have a few friends with internal recs as well who did not receive the e-mail. I know they look at your highschool and college grades and like to see them flow from one to the next. They like that I had a lot of teaching experience that was not just flying. I know they look for 1000 turbine PIC. They like motivation although I'm not sure how they look for that in an application.

I got lucky for the interview, studied hard and am looking forward to joining the Delta ranks.