At Philadelphia International Airport (PHL) in 2026, the Minimum Connection Time (MCT) varies significantly based on whether you are traveling domestically or internationally. For a Domestic-to-Domestic connection (e.g., flying from Boston to PHL and then to Miami on American Airlines), the recommended MCT is 45 to 60 minutes. Because most domestic flights are concentrated in Terminals B, C, D, and E, which are connected behind security, you can often walk between gates in under 15 minutes. However, for a Domestic-to-International connection, you should allow at least 90 minutes, as you may need to transit to the A-West international terminal. The most complex scenario is International-to-Domestic, where you must clear U.S. Customs and Border Protection, collect your checked luggage, and then go back through TSA security; for this, an MCT of 2 to 3 hours is strongly advised. In 2026, PHL's "shuttle bus" service between the commuter Terminal F and the main terminals can add 15-20 minutes to your transit, so always verify your arrival and departure gates in the airline app to ensure you have enough time to navigate the airport's seven distinct terminal buildings.