Table: aircraft_accident_data
Columns: date
airline
aircraft_type
registration
people_on_board
fatalities

Question: How many fatalities shows for the lockheed l-1049g?
SQL: SELECT SUM("fatalities") FROM aircraft_accident_data WHERE "aircraft_type" = 'lockheed l-1049g'

Question: What is the number of people on board at Iberia Airline, with the aircraft type of lockheed l-1049g?
SQL: SELECT AVG("people_on_board") FROM aircraft_accident_data WHERE "airline" = 'iberia' AND "aircraft_type" = 'lockheed l-1049g'

Question: How many fatalities are there for the airline of spantax, with a registration of ec-arz?
SQL: SELECT AVG("fatalities") FROM aircraft_accident_data WHERE "airline" = 'spantax' AND "registration" = 'ec-arz'