For better or for worse, both Frontier and Spirit have decided to use the 'job fair' as the first step in the interview process. No hard facts to support this, but I would guess at least 90% of Frontier new-hires come from either a job fair or a silver bullet. A silver bullet is an internal recommendation from a Frontier pilot. The major job fairs you can find them at is aerocrewsolutions, fapa.aero, Women in Aviation, OBAP, and NGPA. I think they do Osh Kosh as well, but it's a bit late for that. Check with each website for the when and where. Good luck.