November 15,1988,the first and last flight of the Energiya-Buran system took place.

“Energiya-Buran”: unfinished triumph and great legacy." Author: Andrey Elchaninov, First Deputy Director General of the Roscosmos State Corporation

“The development of this universal space and missile transport system became the most ambitious project of Soviet cosmonautics. It still affects Russian space and missile technology and industry, although it was closed shortly after the triumphant flight…”
Source: International aviation and space magazine