Rule #1- Don't Pay Your Taxes.
If you have travelled by commercial air in the last decade you may have noticed a ticket tax that applies to commercial and charter air carriers. The IRS has decided that NetJets should have been charging those ticket taxes, as well. One of the interesting things about the NetJets legal response and lawsuit against the IRS is that they allege their competitors haven't been required to collect these taxes. I don't know whether that is because NetJets business model is somehow unique or that some of their business is conducted as a charter using a lease back agreement from the aircraft owners.