This interactive line chart shows monthly passenger traffic to India for individual airlines, with a dropdown menu to switch between carriers. Each line traces the number of passengers across the 12 months, colored via a categorical scale. The visualization uses d3.v4 with an SVG path updated through a transition on the `d` attribute when the selection changes. Data is loaded from a remote CSV, and axes are generated with `d3.axisBottom` and `d3.axisLeft`. The color scheme comes from `d3-scale-chromatic`.