Here is an interesting story about my Grandpa from the website
http://72.14.253.104/search?q=cache:LZJarkpt2kEJ:www.rr0.org/tech/aeronautique/appareil/avion/DC3.html+twa+dc-3+pilots+schemel&hl=en&ct=clnk&cd=1&gl=us
His name was Gerhardt Schemel and remember hearing this story when I was a kid.
50. July 24, 1957 2215L UC Amarillo, Texas
TWA flight 21 from New York to Phoenix at FL180 had reached northern Texas when Captain G. Schemel saw red and green lights suddenly appear ahead of him at his altitude on a collision course. The sky was dark with thin scattered clouds. Although visibility was greater than 15 miles the flight was operating under IFR conditions. According to the CAA report, eight of the passengers and two hostesses on board were thrown into the aisles and suffered minor injuries when he dove 500 feet to avoid hitting the oncoming object. "One elderly lady was thrown against the ceiling, receiving a bad head cut. Seven additional passengers and two hostesses received bad head bumps and bruised hips and legs." (Anon, 1957) The unidentified object quickly passed above his aircraft and out of sight. The Civil Aeronautics Board investigation of this close encounter could locate no military, commercial, or private aircraft an the area at the time. (Anon., Scientists say near collisions may involve space vehicles, UFO Investigator, Vol. 1, No. 2, pg. 9, August - September 1957, Center for UFO Studies, Chicago, Illinois)