You step...

past the milestone carefully, trying not to make any noise that might disturb the slumbering mystery beyond the bushes. The moon rises over the far mountains at the end of the world and catches on the leading edge of the rudder. As you get closer, the reflected moonlight on the tail illuminates the numbers. The elevator droops from the stabilizer like a crooked tooth and creaks without tempo in the breeze. You faintly hear another sound, like dry leaves, and realize that it's coming from the cockpit.

Do you:
-Return to your first spot
-inspect the cockpit