A
supersonic transport (
SST) is a
civilian supersonic aircraft designed to transport passengers at speeds greater than the
speed of sound. To date, the only SSTs to see regular service have been
Concorde and the
Tupolev Tu-144. The last passenger flight for the Tu-144 was in June 1978 and it was last flown in 1999 by NASA. Concorde's last commercial flight was in October 2003, with a November 26, 2003
ferry flight being its last airborne operation. Following the permanent cessation of flying by Concorde, there are no remaining SSTs in commercial service.