The Mission as a 2hr oscar winning movie
Same cast with Spielberg directing
Expand the characters/back stories, more action sequences etc to fill up extra hour
Have Costner come up with some crazy idea just before they land. a last second thing he decides to do (lands upside down? sideways? - some crazy stunt that would make the audience gasp like in that Denzel plane movie)... or... have aliens save the trapped guy lol