Watch live coverage of Space Shuttle Discovery’s final launch beginning at 12:00 p.m. Lift-off is scheduled for 4:50 p.m. This is Discovery’s 39th and final flight. With the launch of Discovery today, NASA will have launched 133 space shuttle missions. Discovery’s first flight was on August 30, 1984, and it is the oldest orbiter in service today. Discovery has traveled 142,917,535 miles, completed 5,628 total orbits and made 12 flights to the International Space Station.