This line chart displays the average departure delay for USA airlines over time, with each date point visualized as a circle and connected by a smooth natural curve. The visualization uses React to render SVG elements and D3 v5 scales, including `scaleTime` for the date axis and `scaleLinear` for delay values. Data is loaded asynchronously from a CSV file containing daily mean departure delays, and the chart includes labeled axes, grid lines, and interactive tooltips showing formatted dates on hover.