The Shuttle is a Protoss aerospace transport.
With skilled pilots at a premium, the Protoss turned to robotic shuttles to ferry troops over rough terrain and into hostile territory. They are equipped with powerful thrusters, allowing them to carry even massive Reavers within their hulls, but they are not armed with any defensive systems other than a basic plasma shield and a heavily armored hull. They are capable of achieving escape velocity.
After the Brood War, the Protoss still use shuttles. However, they feature a sleeker, less curved design.
Despite the effectiveness of Shuttles, some tribes favor Warp Prisms to ferry their troops.