This line chart compares the popularity of U.S. airlines by passenger count over time, colored by carrier and showing a notable rise for United Airlines between 2012 and 2018. The SVG visualization is built with D3.js v4 within a React framework, using the `d3.scaleLinear` and `d3.axisBottom` APIs to map data from a CSV file. The chart contrasts a D3-rendered interactive plot with a static Tableau image, both displaying trends in domestic and international flight passengers from 2005 to 2019.