ČSA Flight 511 was a flight operated by an Ilyushin Il-18 that crashed near Casablanca-Anfa Airport in Morocco on July 12, 1961. All 72 people on board were killed. The cause of the crash remains undetermined.[1]
On March 28, 1961 another Ilyushin Il-18 operating on the same flight, ČSA OK-511, crashed near Nuremberg, Germany, killing all 52 passengers and crew on board.