Mr. Crouch is the editor of Charles A. Lindbergh: An American Life. He talked about the “Spirit of St. Louis” airplane exhibit at the National Air and Space Museum. Tomorrow is the 74th anniversary of the day Lindbergh departed on his solo Atlantic flight. Mr. Crouch responded to audience telephone calls, faxes and electronic mail. Reeve Lindbergh, daughter of Charles Lindbergh, participated by telephone.