Modern airports are increasingly designed to be self-sustaining "Aerotropolises" that pay for themselves through a mix of Aeronautical and Non-Aeronautical revenue. While they receive some government grants for major infrastructure (like runway expansions), the majority of their income in 2026 comes from you, the passenger. Approximately 50-60% of an airport's profit now comes from "Non-Aeronautical" sources, which include parking fees, high-end retail shopping, duty-free stores, food courts, and lounge access. The other portion comes from "Aeronautical" fees charged directly to airlines, such as landing fees, terminal gate rentals, and passenger service charges. Major hubs like London Heathrow or Dubai International are massive profit-generating machines that contribute billions to their regional economies. Smaller regional airports, however, often struggle to cover their cost of capital and may require local tax subsidies to remain operational, as they lack the passenger volume necessary to attract high-paying retail tenants and frequent "ancillary" spending that makes large airports financially independent.