Question

a plane flies toward the airport. from the perspective of the sun, which objects are moving?
only the airport is moving.
only the plane is moving.
both the plane and the airport are moving.

Explanation:

From the sun's perspective (assuming the sun is stationary for this context), the plane is actively flying (so it's moving). Also, the Earth (on which the airport is located) is rotating and revolving around the sun. So the airport (which is on Earth) is also in motion.

Answer:

Both the plane and the airport are moving.