I believe the "politically correct" term used now is
"Flight Attendant", as "Air Hostess" refers to women, where now there are obviously a lot of men doing the job and have been for quite some time. I also know a few female Flight Attendants that if you called them a "hostie" or "Air Hostess", they would rip you to shreds. So to be safe, I would say Flight Attendant.
Good luck!!!!