How it could and should of been:
1. Alien 1979 (theatrical cut)
2. Aliens 1986 (Director's Cut in Theatres)
3. Predator 1987 (minus few technical goofs & scenes with old creature design)
4. Alien 3 1992 (set on Earth with Xenomorph infestation and ends movie series)
5. Aliens vs Predator 1994 (follows the "just" of the comic story, practical effects instead of CGI, and Rated R)
6. Alien Prequel 2001 (Cameron and Ridley making it, Sigourney is an Executive Producer, H.R. Giver and Stan Winston do the design and effects, story sets up the events of Alien 1979, scary & self contained like Alien 1979 and less action than Aliens 1986 and Alien 3 2001)
It's not rocket science! why on Earth didn't this happen!