At 22 Sekunden Du will see an aero fly into a green Orb and disappear. Here will learn that they communicate while in flight; because Du witness the green Orb blinks in preparation for the incoming aero.
See the red dreieck that the aeros have placed in the cloud. Notice how the wolke housing the dreieck is much darker than the surrounding clouds. See Mehr at www.youtube.com/aerostockians
