Airport taxis or airport limousines are provided by Airport Limo. Alternative chauffeur driven airport limousines can be arranged. Many Salt Lake taxis, limousines and shuttles accommodate ski equipment. One tenth of these cars were limousines or SUVs. Nilsson has built limousines and hearses based on both generations of the S80. These early stretch limousines were often called "big band buses". Fortensky's family arrived in their own cars rather than limousines. Subsequently, all United States presidential limousines have been constructed as armored vehicles. A variety of vehicles have been converted into novelty limousines. All succeeding ones drove in black Mercedes Benz limousines. Very expensive Rolls-Royce Phantom limousines were also produced. These were replaced by four specially built Daimler armoured limousines. Rolls-Royce Phantom limousines were also produced. The U.S. Secret Service operates and maintains the fleet of several limousines. Heavy lift aircraft could bring security, limousines, and helicopters.