Newark serves 50 carriers and is the third-largest hub for United Airlines, the airport's largest tenant (operating in all three of Newark's terminals), and FedEx Express, its second-largest tenant (operating in three buildings on two million square feet of airport property). During the 12-month period ending in July 2014, over 68% of all passengers at the airport were carried by United Airlines. It is also an operating base for JetBlue, who has expanded greatly here after Southwest Airlines ended operations at the airport.