Emergency shuttle

The ship of Optimus Prime's crew carries an emergency shuttle, presumably for use as an escape pod in the event of, oh, say, crashing into a planet.

Animated cartoon
When Ultra Magnus reported to Optimus' crew that Starscream had escaped from the Cybertron Elite Guard's ship; Prowl decided to use Teletran-1's sensors to try and locate him. Finding a moving AllSpark trace on the Moon, he took the shuttle—against Bulkhead's advice—to attempt to locate him.

While in transit, Optimus and Ratchet ordered him to turn the shuttle around, but Prowl refused to listen. Shortly afterward, it was destroyed by a Starscream clone.