Chapter Three: At this time, Billy becomes unstuck for the first time. It's the night of Barbara's wedding and his first encounter with the Tralfamadorians. It's also the first time we hear Billy's prayer, “God grant me the serenity to accept the things I cannot change, courage to change the things I can, and wisdom always to tell the difference." At this time, Billy begins to question the concept of time.
Chapter Four: "Why you? Why us for that matter? Why anything? Because this moment simply is. Have you ever seen bugs trapped in amber? [...] Well, here we are, Mr. Pilgrim, trapped in the amber of this moment. There is no why." Billy is told that people act without free will; he happily believes that all of his actions are predetermined. He gains a new sense of resignation and removal.
Chapter Five: The Tralfamadorians explain their concept of time. "Each clump of symbols is a brief, urgent message—describing a situation, a scene. We Tralfamadorians read them all at once, not one after the other."
Chapter Seven: "Billy Pilgrim got onto a chartered airplane in Ilium twenty-five years after [going to Slaughterhouse-Five]. He knew it was going to crash, but he didn't want to make a fool of himself by saying so." This shows Billy's resignation; but it also demonstrates how he is at peace with his surroundings. He believes the passage of time, along with all events, to be out of his control, so he opts not to worry about them.