Mr. Trump often presses the 1997 Cessna 750 Citation X, which was designed to seat eight people, into action. It has made hundreds of flights since he announced his plan to seek the Republican nomination in June 2015, according to F.A.A. records reviewed by The New York Times.
Dozens of those flights were made after Jan. 31, when the registration expired. The plane flew as recently as Monday, when it was used to transport Team Trump between La Guardia Airport and Buffalo for a campaign event on the eve of the New York primary. On Friday, it flew to Plattsburgh, N.Y., and to Hartford for rallies in those cities, according to radio transmissions broadcast by the plane that were archived on a flight data website and reviewed by The Times.
The price of flying privately does not come cheap. The Trump campaign has paid a company that Mr. Trump owns more than $3 million for campaign-related travel since he announced his candidacy.
The price to register an aircraft, however, does come cheap: It costs only $5, and the registration is valid for three years.
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