The aerodynamic test and training vehicle version of the Soviet _Buran,_ used to train flight crew. It was fitted with four jet engines to enable it to take-off under its own power.

The Soviet Union didn't have an aircraft capable of carrying the _Buran_ until the six-engine Antonov _Mriya_ was completed a month after _Buran's_ first (and only) space flight.

The OK-GLI was not space-capable, lacking any heat-shielding tiles or life support.

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