Determining a fuel schedule for a multi-fuel aircraft engine

A method for operating an aircraft, comprising:

• receiving, by a processing system, a flight plan for an aircraft, the flight plan scheduling a flight for the aircraft to fly non-stop from a first airport to a second airport, the aircraft including a fuel delivery system and an engine, the fuel delivery system including a first fuel reservoir and a second fuel reservoir, and the fuel delivery system configured to selectively deliver at least one of a first fuel from the first fuel reservoir or a second fuel from the second fuel reservoir to the engine for combustion, wherein the first fuel has a first density, and the second fuel has a second density that is less than the first density;
• and
• determining, by the processing system, a fuel schedule for the aircraft to use during the flight, the fuel schedule determined based on a maximum landing weight of the aircraft, the fuel schedule describing when, along a flightpath, at least one of the first fuel or the second fuel is delivered to the engine;
• communicating the fuel schedule from the processing system, to a controller of the aircraft, for implementation of the fuel schedule by the controller to selectively deliver the at least one of the first fuel or the second fuel to the engine during the flight via control signals to the fuel delivery system;
• wherein, when a predicted weight of the aircraft during landing at the second airport following use of the second fuel without the first fuel during the flight is equal to or less than the maximum landing weight, the fuel schedule schedules use of the second fuel without the first fuel during the flight;
• and
• wherein, when the predicted weight of the aircraft during the landing at the second airport following use of the second fuel without the first fuel during the flight is greater than the maximum landing weight, the fuel schedule schedules use of the second fuel and the first fuel during the flight.

A system for an aircraft, comprising:

• an aircraft engine;
• a fuel delivery system including a first fuel reservoir and a second fuel reservoir, the fuel delivery system configured to selectively deliver at least one of a first fuel from the first fuel reservoir or a second fuel from the second fuel reservoir to the engine for combustion;
• a processing system configured to determine a fuel schedule for the aircraft to use during a flight from a first airport to a second airport where the first fuel reservoir contains a quantity of the first fuel and the second fuel reservoir contains a quantity of the second fuel at the first airport, and communicate the fuel schedule to a controller, wherein the processing system determines the fuel schedule based on whether the second airport includes refueling capability for at least one of the first fuel or the second fuel, and the fuel schedule describes when, along a flightpath, at least one of the first fuel or the second fuel is delivered to the engine;
• and
• the controller configured to implement the fuel schedule by selectively delivering the at least one of the first fuel or the second fuel to the engine during the flight via control signals to the fuel delivery system.