Kopeloi.
Despite asking twice I see, no-one, least of all our dear friend Mike wants to answer. Therefore I will.
No. You do not have a contract with Netjets, you have a contract with a bank in the Cayman Islands, or Bermuda, or Isle of Man, or anywhere else they can put you offshore and away from Portugal!
Why do you suppose this is?
So who exactly are you employed by? A Bank in the Cayman islands? Oh, it's payday. And your money comes from Switzerland. Which is where another company that owns the aircraft live, not Netjets, not Portugal. But you work for a Portuguese company right? Paying Portuguese taxes or your own local taxes?
Arn't we all?
The term "time bomb" springs to mind.
Hope that answers your question.