Core Insights - The airline industry increasingly relies on ancillary fees for revenue, with some airlines generating more income from these fees than from ticket sales [1][8] - Major airlines like United Airlines and Delta Air Lines are facing lawsuits for allegedly misleading customers about the availability of actual window views from "window seats" [4][5] Group 1: Ancillary Revenue - Low-cost carriers such as Frontier Airlines, Spirit Airlines, Volaris, Breeze Airways, and Allegiant derive a significant portion of their revenue from ancillary fees, with figures ranging from 52.9% to 62% [8] - United Airlines charges up to $50 for window seat assignments on domestic flights and $100 for some international flights, while Delta Air Lines charges up to $40 for higher ticket tiers plus additional fees for window seat selection [6] Group 2: Legal Issues - A class action lawsuit has been filed against United Airlines and Delta Air Lines, alleging that over a million passengers were misled into paying for window seats that do not provide a view [7] - The lawsuits highlight that certain aircraft models, including Boeing 737, Boeing 757, and Airbus A321, have "window seat" positions that do not actually offer a window [5]