"Overseas"? As in outside the States right?
Bear in mind this website is a bit more UK centred and there is also a significant international crew out here. So "overseas" tends to be the other way round
For your info:
- PAS = Petroleum Air Services PAS
- NHV = Noordzee Helikopters Vlaanderen Company
And as far as I know there isn't any "Master List with all International Helo Operators" (As in outside the States or Europe), it would surely come handy, perhaps that would be your next endeavour?