I'm gonna go ahead and disagree with you. Netjets pilots are full-fare paying passengers. They are unable to jumpseat or non-rev on an airline and as such should never have to check in with the flight crew. If the flight crew has a problem with that it's due to their own ignorance. If I were a netjets pilot I would not check in with the crew and if they asked I'd simply explain what has been said numerous times in this thread already.