This network graph visualizes airline flight connections between seven global cities, with nodes colored by regional group and links showing direct routes. Built with D3 v7, it uses `d3.forceSimulation` with `forceLink`, `forceManyBody`, and `forceCenter` to position nodes via a physics-based layout. The SVG rendering dynamically updates node positions and link coordinates on each simulation tick, while `d3.drag()` enables interactive node repositioning. City labels follow each node’s current position, and the force-directed algorithm automatically spaces connected airports.