Frankfurt Airport (FRA) is a "mega-hub" designed for long waits. For a 4–6 hour layover in 2026, stay airside and visit the Visitors' Terrace in Terminal 2 for fresh air and plane spotting, or catch a free movie at one of the "Movie Worlds" in Terminal 1. If you need rest, the NapCabs (soundproof sleeping cabins) are available for hourly rental. For layovers longer than 7 hours, take the S-Bahn (S8 or S9 train); it’s a 15-minute ride to the "Frankfurt Hauptwache" station in the city center. Once there, you can walk through the Römerberg (medieval old town), grab a traditional "Apfelwein" (apple wine) in the Sachsenhausen district, or stroll along the Main River. In 2026, the airport also offers "XXL Tours" of the tarmac for aviation geeks. Just ensure you allow at least 90 minutes to clear security upon your return, as FRA is notorious for long lines during peak 2026 travel periods.