Five Shuttles flew to space - Columbia, Challenger, Discovery, Atlantis, Endeavour. And Buran - the one which flew (other Soviet spaceplanes would have differen

Five Shuttles flew to space - Columbia, Challenger, Discovery, Atlantis, Endeavour. And Buran - the one which flew (other Soviet spaceplanes would have different names, so Buran is like Columbia, not like Space Shuttle) - didn't have e.g. the life support system; it was rather a development flight, than a demonstration of a complete system. Still Buran (as a combined name, like Energiya-Buran program) had some better capabilities e.g. no toxic propellants onboard (Shuttle has to be chemically "pacified" after each landing) and longer orbital life (with cryogenics onboard).