It seems like all the Delta connection carriers are S3 - Comair, ASA, Skywest.. and NWA (Pinnacle, Mesaba), US Airways subsidiaries (PSA, PDT, even non-wholly owned like AWAC) are positive space. The only company I interviewed with that was S3 was Comair.. and I missed my first interview date because of it, after standing by like 10 hrs at the airport. The ticket counter agent was like, "they're interviewing you for a pilot position and didn't positive space you?? "