A grouped bar chart visualizes airline delay totals across six airports for each month of the year, with each airport’s monthly value rendered as a distinct bar. The chart uses D3 v7’s `d3.scaleBand` for the month categories on the x-axis and `d3.scaleLinear` for the delay magnitude on the y-axis, both fed by an external CSV file. SVG `rect` elements represent the bars, while `d3.axisBottom` and `d3.axisLeft` generate the corresponding axes. The data originates from the `airline.csv` file, containing airport, month, and total delay values.