system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] How did the auto-pilot in Charles Lingburgh and Amelia Earhart’s transcontinental planes work so they could sleep or use the bathroom?
gpt
Charles Lindbergh's Spirit of St Louis had no autopilot.  In fact, it was designed with intentional instability, to aid in keeping the pilot awake.

Earhart used a Sperry autopilot, which could maintain heading and pressure altitude.