Philadelphia International Airport (PHL) is considered a large-scale hub, particularly for American Airlines. Spanning approximately 2,600 acres, it features seven terminal buildings (A-East, A-West, B, C, D, E, and F) and 126 boarding gates. In 2026, it continues to serve over 30 million passengers annually, ranking it among the top 25 busiest airports in the United States. While it isn't as physically massive as "mega-hubs" like Denver or Dallas/Fort Worth, its layout is quite long and linear; walking from Terminal F (regional flights) to Terminal A-West (international flights) can take upwards of 20 to 25 minutes, though a shuttle bus connects these distant points. Its proximity to the city center—just 7 miles from Center City—makes it one of the most conveniently located large airports in the Northeast Corridor.