A line chart displays the number of US airline flights over time, using the US Airline Traffic Dataset. The visualization renders a single black line against a light gray inner rectangle, with labeled time and flight count axes. It uses d3’s `scaleTime`, `scaleLinear`, `line`, `axisLeft`, and the `xAxis` and `yAxis` helpers from `@curran/axis-labels` to plot each data point as a small circle.