I am going to write a book about Movie Theatres some day. I worked projection for 16 years and put up all those trailers. Briefly: In the beginning, we put on what we wanted, then the chains/ studios figured they could make $$ by marrying the prints and the trailers to the point of me loosing my mind. Changes requested at the last second because some Asshole producer was coming to see a film and we had to show a trailer. That's just one thing. I could go on for chapters (So buy the book if it ever comes out)
BUT, although we were "Regulated" by what went on; I always was one to make the programing go as quickly as possiible, like cut the "Green" at the start either completely off or in half. If it was a preview that had a 4 min version and a 60 second version, I'd use the .60 second. Etc, etc.
When I picked what went on, it was LA Times, Coke, 3 previews, the "Logo" and sound logo - that's it. Plus if a trailer sucked, it never went on. In addition, I would always put the "cool" trailer last, right before the feature. Mostly, so I could run down and watch it in house.
Buy my book...there will be naughty stuff in it...