A fictional side-on cross-section of airspace, not to scale and with no altitudes. Class G, non-controlled airspace, fills the space from the ground. Around a controlled aerodrome on the right, a stepped Class C or D control zone reaches the ground near the aerodrome and has higher bases further out. Class E sits above the lower airspace, and Class A is high-level controlled airspace at the top. A remote pilot launches a drone in an open area in Class G; a dashed line rises from the drone through E and A, showing controlled airspace above a site that looks open on the ground. Buttons highlight one class at a time or move the site next to the aerodrome, inside the control zone.
