I think Passengers was written before Spaihts ever met with Ridley Scott about Alien, so if anything, Scott borrowed from Spaihts a little. The idea of couples on a colony ship isn't far from Passengers. I actually read Shadow 19, a spec by Spaihts from before he got anything produced. Very fun script with pretty weak characters. I still think it would make an amazing movie if they got someone to work on the characters and dialogue a bit with him. In Shadow 19, there is a ship called the Prometheus...