See:
https://www.faa.gov/licenses_certificates/aircraft_certification/aircraft_registry/reregistration/
Thanks for that. It saved me the time of looking it up. My husband and I owned and operated a flying club for years and owned several general aviation airplanes and never had to renew a plane’s registration. We were in business after 9/11 and hadn’t run into anything like this but it does look like things have changed. We closed the business in 2006. Stay alive long enough and you will learn all kinds of new things!