The Donald isn't exactly shy. If you do a search on "Trump 757" you'll get about a million pics showing it.
Trump must be very above board on all his state taxes for all of his expensive toys, otherwise the media would be all over a story about him avoiding state and local taxes, ala JF’n Kerry and his yacht.
I once worked in Klamath Falls, Oregon and this large, plain white 737, with no other markings except the tail number, showed up on the tarmac and remained there for several months. As I was working on several airport projects there at that time, I asked the airport manager who owned that plane. He told me it was the Disney family’s private plane and that they would fly it up from California and park it for 3 months to avoid state taxes. An additional aside apparently Kfalls used to be where Walt Disney and family would escape to for down time and to work on their ranch, which has since been turned into the Running Y Ranch Resort (great golf course).