This histogram visualizes the distribution of National Aviation System delays using a steelblue bar chart with 20 uniform bins. The chart includes four black annotations that explain design choices, such as the zero-based y-axis, equal bin widths, neutral color palette, and interactive tooltip functionality. Built with D3 v7 and d3-svg-annotation, it renders SVG bars with hover tooltips displaying exact range values and counts. The visualization uses CSV data loaded from a GitHub repository, featuring enlarged margins and clear axis labels to ensure readability.