This line chart visualizes air traffic passenger statistics for San Francisco Airport from 2005 to 2019, comparing annual passenger numbers for multiple airlines. The chart displays each airline as a separate colored line, with year on the x-axis and passenger counts on the y-axis. It uses React and D3 v4 to render an SVG-based chart with animated transitions between states. The data is embedded directly in the page, and the visualization uses D3’s scale functions and axis components to map the temporal and numerical dimensions.