If The Economist magazine is correct when it states
" The purge that Mr Erdogan has launched against the group and its sympathisers has swept up over 100,000 people. Last week 50,000 civil servants were dismissed by decree. Soldiers, journalists, academics, airline pilots and businessmen have all been targeted."
then I would guess Turkish Airlines inability to recruit foreigners may be about to get a whole lot more urgent. . . . . .