I applied before, so this time, I got a call from Delta's recruiter. They booked for an interview at ATL, flew me down for an one day round trip. Hop on taxi from airport to office. Met HM, and one hour interview. Left home at 6am, gotten back at 11pm. Long day. Just prepare to pace yourself!! Don't overeat, be sure to know yourself and materials about the role you are applying for.