Shuttle Discovery's final launch attempt, scheduled for November 22, was postponed until December 3, NASA said on its website on Friday. The delay was the latest in a series of postponements for NASA's oldest and most traveled space shuttle. Previous launches were delayed due to weather conditions and technical problems. "The Kennedy Space Center "Call-to-Stations" to begin the launch countdown will be no earlier than Nov. 30, supporting a first launch attempt no earlier than Dec. 3 at about 2:52 a.m. EST," NASA said. Following the STS-133 mission, Discovery will be the first of the shuttle fleet to retire. According to NASA, Discovery has flown 38 missions to date - more than any other shuttle - and orbited the Earth more than 5,600 times.