Task: Question Generation
Input (English): Context : The 1961 Derby Aviation crash refers to the fatal crash of a Douglas Dakota IV, registration G-AMSW, operated by Derby Aviation, a subsidiary of British Midland Airways, on the mountain of Canigou, France, on 7 October 1961. 
Answer : 7 October 1961
Output (English): On what date did 1961 Derby Aviation crash occur?