This interactive network visualization shows direct flight routes between six U.S. cities as a force-directed graph. Nodes represent cities, and gray lines depict connections. Users can drag nodes to reposition them within the layout. The implementation uses D3 v7’s `forceSimulation` API to calculate the graph layout, combining `forceLink` with a `forceManyBody` charge and a `forceCenter` force, while `d3.drag` handles interactive node manipulation. The graph is rendered as an SVG element with circles and labels.