Methods and systems are provided for guiding or otherwise assisting operation of an aircraft en route to an airport. One method involves identifying a reference point in advance of a runway, dynamically determining a gliding vertical trajectory for the aircraft en route to the reference point based at least in part on a current altitude of the aircraft at a current aircraft location and gliding characteristics of the aircraft, and providing a graphical indication of a difference between a predicted altitude of the aircraft at a location corresponding to the reference point resulting from the gliding vertical trajectory and an altitude criterion associated with the reference point. The graphical indication of the difference dynamically updates as the aircraft travels.