Republican presidential frontrunner Donald Trump has not renewed the registration permitting his private jet to fly, The New York Times reported Tuesday.

Federal Aviation Administration records show that the permit for Trump’s 1997 Cessna 750 Citation X expired on Jan. 1. An agency spokeswoman confirmed to the Times that its owner had not renewed it.

Trump campaign spokeswoman Hope Hicks told TPM via email that “The standard renewal process is just about complete.”

It costs $5 to renew the registration, which lasts up to three years, according to the Times. The FAA told the newspaper that maximum penalties for flying without registration include “a civil penalty of up to $27,500, a criminal fine of up to $250,000 and imprisonment for up to three years.”

The newspaper reported that the plane in question was last used on Monday to transport campaign staff members across New York state. Trump additionally has a Boeing 757 and three helicopters. The Times reported those aircraft all have up-to-date permits.

The FAA warned DJT Operations CX, the LLC that Trump owns and that operates his plane, when the registration was set to expire and reminded the LLC again when it did expire, according to the report. But the Times noted those notices were sent to National Registered Agents, a company Trump does not own that he listed as the contact for DJT Operations CX when he first registered the aircraft.