Sectors are 60-degree wedges from the board centre, tucked against the tray. Radial seams mark the ABCDEF flats. Roll back with git checkout feat/airport-edge-runway.
Entry side is the 60-degree wedge of the port, not the cell-edge direction. Levels regenerated; hint line joins the waiting plane to the on-board path.
Board-edge runways reach the tray outline with a threshold gate, fixed apron slabs mark each side, and a connected side lights the whole plane-to-stand channel in the neutral hint colour.
toshiocn