user: Question: In what location were the fatalities Unknown for the Ju-52 aircraft?
Columns: ['Location', 'Aircraft', 'Tail number', 'Aircraft damage', 'Fatalities']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Quelimane', 'Lockheed L-14', 'CR-AAV', 'W/O', 'Unknown']
SQL:

assistant: SELECT "Location" FROM "Table" WHERE "Fatalities" = 'Unknown' AND "Aircraft" = 'Ju-52';