This example visualizes the number of flights in the US airline traffic data for each month of 2020 using a bar chart. The bars display the total flight counts per month, with the year’s monthly trend clearly visible. The visualization is built with D3.js, using `scaleBand` for the x-axis months and `scaleLinear` for the y-axis flight counts, along with axis and label helpers from `@curran/axis-labels`. Data is sourced from the `@Ljz2018/us_airline_traffic` dataset, filtered to the year 2020.