Yes, you can technically leave the airport during a connecting flight (layover) in 2026, but whether you should depends on the length of the layover and your visa status. For a domestic connection within the same country, you are free to walk out of the airport at any time; you just need to allow enough time to clear security again (usually 2+ hours). For an international connection, you must pass through Immigration and Customs to "officially" enter the country. This requires you to have a valid visa or be from a visa-exempt country (like US citizens in the Schengen Zone). Most travel experts recommend leaving only if your layover is at least 6 to 8 hours. If your layover is under 4 hours, the time required to deplane, clear immigration, travel to the city, and return through security makes it nearly impossible. Some airports, like Singapore Changi or Istanbul, even offer free city tours for passengers with long layovers, provided you meet the entry requirements. Always check with your airline to ensure they don't have a "no-exit" policy for specific discounted transit fares.