Source : Wikipedia, http://en.wikipedia.org/wiki/Tupolev_Tu-144

A Tu-144 crashed in 1973 at the Paris Air Show, delaying its further development. The aircraft was introduced into passenger service on 1 November 1977, almost two years after Concorde. In May 1978, another Tu-144 (an improved version, named Tu-144D) crashed in a test flight while being delivered, and the passenger fleet was permanently grounded after only 55 scheduled flights.

The aircraft remained in use as a cargo plane until 1983, by which point a total of 102 commercial flights had been completed. The Tu-144 was later used by the Soviet space programme to train pilots of the Buran spacecraft, and by NASA for supersonic research.

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