United Systems Military's top-secret scientific research ship finally took the xenomorphs out of the clutches of Weyland-Yutani and into the most sensible hands imaginable: Bioweapons scientists working for the military. While the interior sets were very cool, the exterior was about as generic a sci-fi spaceship as has graced one of these movies.
David Fincher's vision for the third film included jettisoning Ripley's hypersleep chamber off the Sulaco and onto the prison planet Fiorina "Fury" 161. Although the pod itself is only seen in a handful of shots, it made a memorable landing on the planet in what appeared to be an homage to Kubrick's "riding the bomb" shot from Dr. Strangelove.
Ripley uses the Nostromo's lifeboat to escape, and the small craft winds up floating through space until a salvage crew rescues it at the start of James Cameron's Aliens. Thus, the ship served as an important linking device between the first and second films.
This Weyland-Yutani spacecraft has the honor of being without a doubt the largest ship in the series, with its ability to transport 2,000 colonists, 1,140 second-generation embryos, and a crew of 15. It also contains several dropships and a massive cargo transporter sled used during the action-packed climax.
Before Joss Whedon created Firefly, he made a trial run at a crew of misfit space pirates in his Alien screenplay with The Betty, an aging transport ship with a scrappy design. When Ripley boards it towards the end, she declares, "This piece of sh*t is even older than I am."
This troop transport ship for the Colonial Marines is badass. Designed by Syd Mead, its very shape was meant to resemble a gun, and it contains not only troops but dropships, vehicles, power loaders, missiles, and everything else a growing boy needs.
A Heliades-class space exploration vehicle built and operated by Weyland Corp, this design gave the Alien series a different flavor. A more sleek design than any of the military of carrier ships, it feels like a more upper-class way to travel through space. Piloted by Captain Janek (Idris Elba), it is used to ram the engineer ship at the climax of Prometheus.
This combat-ready spacecraft carries the Colonial Marines from the Sulaco to the surface of LV-426, and also has an M577 Armored Personnel Carrier truck in its belly. This is like the Vietnam-era Huey Helicopter of the Alien universe.
Designed by Ron Cobb, this Weyland-Yutani M-Class starfreighter is used to haul stuff through the vastness of space. While the big stacks that look like a floating city is just the cargo carrier, the ship itself detaches itself before making its fateful trip to the surface of LV-426.
A croissant-shaped ship with a bio-mechanoid, asymmetrical design is discovered shrouded in an eerie fog by the Nostromo crew on LV-426. The fact that it was designed by H.R. Giger himself gives it a kinship with the xenomorph itself, as does its vaginal openings. The ship later popped up again...
...in Ridley Scott's Prometheus and Covenant as the space vehicle of choice for the Engineers. We got to learn the origin of the famous "Space Jockey" piloting it, and also watch the sucker crash pretty hard.