That's true of all Stephen King films.
In every single one, the director feels it prudent to take the dialogue--King's absolute worst writing quality--straight out of the book, and apply it to the script verbatim.
Who in their right fucking mind does such a thing? King isn't nearly as clever in his composition as he thinks he is, and yet the people who make films based on his books seem to take his word for it that he's such a genius without actually reading the material--which is absolutely bewildering!
It's the same formula every time: a series of closely knit characters with their own esoteric network of slang and short-hand dialogue encounter a paranormal entity/event that harks back to their past(s). Throw in the young and/or introvert prodigy, the obligatory religious zealot, and the self-appointed bearer of sagely advice and you have a full blown King story.
How could someone miss that shit!?
All of this being said: Langoliers was the least shitty King film I've seen. It still had the stilted dialogue with all the other King tropes. But somehow it just didn't take itself as seriously as the other films, which made it one of the better B (C?) movies to sit through.