I applied online. The process took 5 months. I interviewed at Southwest Airlines (Dallas, TX) in Mar 2017
Interview
I applied in October and was told in December that I made it to the next round. In February I got a call for a screening interview. I was studying abroad so I had a phone interview conference call with a recruiter and 4 managers. If I had been in the country they would have flown me down to Dallas to interview.