I don't think that having 5 or even 10 LOR's is the key to an interview. I believe the most important thing is your app. Make sure it is filled out correctly with absolutely no misspellings. Make sure you went to a quality college and got a quality degree in an appropriate time and most importantly a good GPA. The more boxes you fill in on the app the better your chances. If you have great app then comes a good LOR. Its far more important to have a good LOR than a lot of LOR's. I was told if someone writes you a LOR and they also wrote 5 others for other pilots and they interview the others and don't hire them then they are not as likely to call you. So in other words quantity is not as good as quality.

Delta has hired somewhere around 400 pilots. Most of those guys have flow or SSP and the majority of the rest hired are military. It would appear that of the 400 hired less than 50 of those are OTS with no military or SSP. The gates are just starting to open and it will only be a matter of time but their is some extremely stiff competition at the front of those gates as well.