Technically, yes, you can leave the airport during a layover in 2026, but the logistical "price" is high. For Domestic flights, you can walk out of the airport at any time, provided you have your boarding pass for the next leg; you simply have to clear security (TSA) again when you return. For International flights, leaving is much harder: you must pass through Immigration and Customs, which requires a valid visa or entry permit for that country. If you leave, your checked luggage will stay on the plane or in the airport's secure system (you won't have access to it). You must allow at least 6 to 8 hours of layover time to account for the time it takes to exit, travel to a city, and return through security—which can be notoriously long at major hubs. In 2026, many travelers also risk "Hidden City" penalties if they leave at a layover and never return for the final leg; airlines may cancel your return flight or even ban you from their loyalty program if you "drop" a segment of your ticket.