What Terminal is Delta Airlines at PIT. Delta Air Lines operates from the Landside Terminal at Pittsburgh International Airport (PIT), mostly using Concourse C. Delta's check-in counters are located on the Departures Level of the Landside Terminal, where travelers can check in and drop off their bags. After completing security, passengers proceed to Concourse C, which houses Delta's gates. Concourse C has a variety of services, such as dining options, shops, and seating places, to ensure Delta customers' convenience and comfort. Delta's location at PIT allows for convenient access to major domestic destinations, making it a popular airline for Pittsburgh travelers.