user: Question: How many fatalities are there for the airline of Spantax, with a registration of EC-ARZ?
Columns: ['Date', 'Airline', 'Aircraft type', 'Registration', 'People on board', 'Fatalities']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['1965-05-05', 'Iberia', 'Lockheed L-1049G', 'EC-AIN', 49.0, 30.0]
SQL:

assistant: SELECT "Fatalities" FROM "Table" WHERE "Airline" = 'Spantax' AND "Registration" = 'EC-ARZ';