I stumbled on this thread by accident. I don't work for NetJets, I do know somebody who does but I certainly would not ask that person to divulge any, even remotely security-linked information. The information being requested is of the sort likely to attract the attention of the Security Services themselves. No employee worth their salt or who values their continuing employment would dream of divulging any such information. If you really want the information for a genuine purpose then I suggest you obtain it in the sensible, correct manner and write to the company.