Little known fact: Trump flew for months during his campaign in 2015 and 2016 in one of his aircraft with an expired registration (it would have cost $5 to renew it properly). When the FAA grounded it, Trump evaded the rules by selling the aircraft from one of his shell companies, DJT Operations CX, to another, DT Endeavor I.
The FAA knew this and did nothing. https://journa.host/@w7voa/112951222063547784