Title
This interactive visualization explores 2020 airline delay data for four U.S. carriers (AA, AS, B6, DL) across twelve months. It presents three coordinated scenes: a multi-line chart of monthly flight counts, a multi-line chart of delay percentages, and a bar chart of delay causes. Users can toggle between airlines via buttons and select specific months using a dropdown menu. The SVG-based charts are built with D3 v5, using `d3.csv`, `d3.scaleOrdinal`, `d3.line`, and tooltip interactions via mouse events. Data is sourced from three separate CSV files covering flight volumes, delay rates, and delay cause breakdowns.