President Asif Ali Zardari left for the United States here on Sunday to lead Pakistan delegation and address the 63rd session of the UN General Assembly in New York on September 25. President Zardari, who took a commercial flight of the British Airways for this journey, was being accompanied by the Foreign Minister, Finance Minister, Information Minister, Advisor to the Prime Minister on National Security, the Chairman National Reconstruction Bureau and senior officials. The President used Rawal Lounge of the Islamabad International Airport for his simple and quiet departure, as against the usual practice in which red carpet is rolled out at Chaklala Airbase for the arrivals and departures of VVIPs.