Landing length depends on total weight. Use of full reverse thrusters can shorten the distance substantially. A plane that’s low on fuel requires a shorter runway.
Takeoff also and the rate of climb also depends on weight of the aircraft. Get rid of the passengers with their luggage and airliners almost jump into the air if they get a rolling start. A low rate of climb decreases the needed runway because the plane can stay in ground effect while it gathers airspeed.
My thoughts are to look for a landing field capable of supporting the characteristics of the plane in question.Then draw an arc of the length of the distance flown as defined by the RR engine feed back Search along the arc for a landing field capable of landing the 777