This small multiples line chart displays yearly average carrier delay counts for multiple airports, with each airport shown in its own grid cell using a shared y-axis scale. The visualization is built with D3 v6 and renders as SVG, using `d3.csv` to load data, `d3.groups` to nest records by airport and year, and `d3.mean` to aggregate delay values. Each chart includes axes via `d3.axisBottom` and `d3.axisLeft`, a line generated with `d3.line` and `curveMonotoneX`, and hover tooltips triggered by mouse events on data circles.