* Weight is the force of gravity acting on the plane's mass. This force always acts downwards, regardless of the plane's position or movement.

Let's look at why the other options aren't the primary force acting at a distance:

* Drag: This is the resistance the plane experiences from the air as it moves. It opposes the plane's motion.

* Thrust: This is the forward force generated by the plane's engines.

* Lift: This is the upward force that keeps the plane in the air. It's generated by the shape of the wings and the movement of air over them.

In summary: While the other forces act on the plane, weight is the only force that acts on the plane due to its distance from the Earth (and therefore the force of gravity).