This D3.js v7 SVG scatterplot displays the relationship between the number of carrier delays and late aircraft delays at various airports, with each point colored by airport name using a ColorBrewer Set3 qualitative scale. The visualization encodes two quantitative variables along the axes and a categorical variable through color, with a manually constructed legend listing the 12 unique airports. The code loads CSV data from a remote GitHub repository, applies linear scales for both axes, and uses d3.axisBottom and d3.axisLeft for tick marks, while the d3-legend library is included but the legend items are appended manually as colored rectangles.