??121.643 Fuel supply: Nonturbine and turbo-propeller-powered airplanes: Supplemental operations.(a) Except as provided in paragraph (b) of this section, no person may release for flight or takeoff a nonturbine or turbo-propeller-powered airplane unless, considering the wind and other weather conditions expected, it has enough fuel???(1) To fly to and land at the airport to which it is released; (