Donald Trump’s jet is not registered to fly. https://t.co/1zCUIyWF9O

— Gideon Resnick (@GideonResnick) April 19, 2016

Records kept with the Federal Aviation Administration show the aircraft’s registration lapsed on Jan. 31. Laura J. Brown, a spokeswoman for the Federal Aviation Administration, confirmed that the plane’s registration was not in good standing and said the owner had not renewed it.

With few exceptions, aircraft must be registered in order to fly. Mr. Trump’s plane could be grounded for several days, or even months, while the issue is sorted out. In the event of an accident, the company that insures the plane could use the expired registration as a reason to decline any claims.

The F.A.A. could also fine or assess other penalties against the owner and/or operator; Mr. Trump owns the plane through a limited liability company. Though it is unlikely that the F.A.A. would seek the maximum penalty, flying with no registration could result in a civil penalty of up to $27,500, a criminal fine of up to $250,000 and imprisonment for up to three years, the agency said.

Attention to detail. How does that work?