Air New Zealand stopped it's Antarctic charter flights after the Erebus crash of 79.
Qantas is still currently running theirs.
As far as polar navigation goes, I know that compasses on aircraft flying near the North Pole all point south so presumably those near the South Pole would all face north.
I'm sure modern nav systems are designed with these situations in mind but I'll leave that to the experts to explain.
An interesting subject although those Antarctic flights don't go anywhere near the South Pole.