What were the 4 space shuttles?

What were the 4 space shuttles? Between 1981 and 1985 a fleet of four orbiters—Columbia (the first to fly in space), Challenger, Discovery, and Atlantis—was put into service.

Between 1981 and 1985 a fleet of four orbiters—Columbia (the first to fly in space), Challenger, Discovery, and Atlantis—was put into service.