The Lusitania is a spacecraft featured in one of Samus Aran's flashbacks to her days in the Galactic Federation Army. It seems to be a commercial transport capable of carrying 300 passengers, and bears resemblance to a modern day space shuttle as well as modern aeroplanes.
The ship had a large detachable drive unit that malfunctioned during flight and Ian Malkovich was sent over to make repairs when the drive unit went critical. After detaching the drive unit on Adam Malkovich's orders, the drive unit exploded, killing Ian. In the flashback, it is shown that Samus - very young and naive at the time - pleaded with Adam to let her go on board to save the people in the drive unit, but Adam denied her and later remarked that if they had hesitated to remove the unit, it would put everyone aboard the ship in danger.
The ship was last seen in tow of Adam's battleship. The ship is white in coloration with green stripes going along the hull, it also has a yellow insignia of a ringed planet on both wings.
- Considering the Metroid Series' admitted inspiration from Alien movie series the Lusitania is most likely an homage to the Nostromo. Both ships are smaller vehicles that are attatched to much larger drive units.