The United Airlines flight from New York to Salt Lake City crashed into a peak on the Medicine Bow Mountains on October 6 1955 and dropped to a ledge some 2000 feet below, killing the pilot, C Cook, his First Officer and 62 passengers. Recovered mail received a three line explanatory cachet ‘DELAYED AIR MAIL/ INTERRUPTION / LARAMIE WYO 10.6.55. (Sanford Ref. 551006)