Is it permissible to work as a flight attendant while wearing the hijab, given that she will be living in another country without a mahram?

A woman is permitted to work as a flight attendant if she maintains her hijab, travels with a mahram, is not exposed to khalwa (private seclusion) or unlawful mingling with men, and does not serve forbidden things. However, if these conditions are not met, her work is impermissible, because it necessitates her traveling without a mahram and exposes her to interaction with men, and to them seeing from her what is not lawful for them. A woman's residing in another country without a mahram is permissible if she is safe from fitna (temptation/strife) and suspicion is dispelled; the mahram is only required for travel.