John Van Geffen co-authors article in the IATSBA Newsletter on 'The New Tax Bill & Aircraft Values' Pablo Perez, Accredited Senior Appraiser, and John T. Van Geffen, partner, Avialex Law Group, authors of article on aircraft valuations and the new tax bill. John Van GeffenAugust 2, 2018aircraft sales, aircraft valuation, new tax bill, AMSTAT, ederal Excise Tax, like-kind exchanges, business aviation Facebook0 Twitter 0 Likes