Task: Question Understanding
Input (English): Context : Varig Flight 254 was a Boeing 737-241, c/n 21006/398, registration PP-VMK, on a scheduled passenger flight from São Paulo, Brazil, to Belém, Pará, Brazil, with several intermediate stopovers, on 3 September 1989. 
Question : When did Varig Flight 254 occurr?
Output (English): point in time