Task: Question Generation
Input (English): Context : The 2007 Balad aircraft crash was a 9 January 2007 airplane incident involving an Antonov An-26 airliner, which crashed while attempting to land at the Joint Base Balad in Balad, Iraq, which was at that time operated by the United States Air Force. 
Subject : 2007 Balad aircraft crash 
Relation : point in time
Output (English): On what date did 2007 Balad aircraft crash occur?