I asked about this on my interview. They explained that per their ops specs they can use the auto pilot or a first officer. Also they have a mail operation, once you have a certain amount of time you start flying PIC in the mail plane which does not require an ATP. Then you get your ATP and start flying PIC with passengers. Everything I was told about the program seemed to indicate that they knew what they're doing and that it has all been worked out with the FAA/FSDO.