Swiss International Air Lines (SWISS) uses Check-in 1 and Check-in 3 at Zurich Airport (ZRH). Check-in 1 is the main terminal area for SWISS, while Check-in 3 is located directly above the airport railway station, providing a convenient option for those arriving by train. Once checked in, passengers proceed to the "Airside Center." Flights typically depart from one of three gate areas: Gates A, B/D, or E. Generally, domestic and Schengen-area flights (within Europe) depart from Gates A or B. Most long-haul and non-Schengen international flights depart from Terminal E, which is a satellite terminal accessible via the "Heidi Express" underground tram. SWISS also maintains several world-class lounges throughout these terminals, with the most famous being the First Class and Senator lounges in Terminal E, which feature outdoor terraces with views of the Alps and the runways.