Concorde.
January 21, 1976 was the first scheduled flight.
The first flight was March 2, 1969. The first commercial flight was January 21, 1976. And Concorde was retired November 26, 2003.
The first test flight of the Concorde took place on March 2nd 1969 in Toulouse, France.
The first flight of Concorde 001 (The French verision), F-WTSS, on March 2nd 1969
concorde's air france flight no. 4590 crashed in gonesse france on 25th july 2000
The Concorde 001, F-WTSS, first took flight on March 2nd, 1969. See the related link, please.
It was first thought of in 1956, but the first Commercial flight was in 1976.
Scheduled flight started on January 21, 1976
No, you cannot unlock a Concorde on Flight Simulator X Acceleration. You can download addons though, I have a link for the Concorde below this question.
Commercial flights, by British Airways and Air France, began on 21 January 1976. As a result of its only crash (in 2000), world economic effects arising from the September 11, 2001 attacks and other factors, operations ceased on 24 October 2003, with the last "retirement" flight on 26 November that year.
Heritage Concorde will have all the answers you need, its amazing site full of so much info, i think the year was 1969.