Conversation so far:
When did Lindbergh start flying?
In the early morning of Friday, May 20, 1927, Lindbergh took off from Roosevelt Field across the Atlantic Ocean for Paris, France.
Did he make any stops along the flight?
Over the next  33 1/2 hours, Lindbergh and the Spirit faced many challenges.

Question: What challenges did he face?
Self-contained rewrite: What challenges did Lindbergh face?