Airport planning in 2026 is an incredibly complex process that blends aviation engineering with urban "Aerotropolis" design. It begins with a Master Plan that projects regional travel demand for the next 20 to 50 years. Key factors include wind patterns and topography (to determine runway orientation), environmental impact assessments (noise and local wildlife), and "multimodal" integration (linking the airport to high-speed rail and highways). Modern 2026 planning also prioritizes "Sustainability-by-Design," incorporating solar farms, rainwater harvesting, and hydrogen refueling infrastructure into the initial blueprints. Additionally, planners now use AI-driven passenger flow simulations to design terminals that minimize walking distances and prevent bottlenecks at security. Unlike the isolated hubs of the past, today's airports are planned as entire "cities" that include convention centers, hotels, and tech parks, ensuring the airport becomes an economic engine for the entire region.