the airline industry is a crapshoot. the priority delivery carriers probably not so much. and seniority is paramount.
good advice on surviving a career from a retiring captain 30 yrs ago still applies...
1. if you are married...dont get divorced.
2. always live on the pay one seat below you hold.
3. find a second job.
4. plan on your life being turned upside down every 6 or 7 years.