CREATE TABLE table_name_4 (fleet_size INT, iata VARCHAR, commenced_operations VARCHAR)

What is the of Fleet size with a IATA of pr, and a Commenced operations smaller than 1941?
SELECT SUM(fleet_size) FROM table_name_4 WHERE iata = "pr" AND commenced_operations < 1941
SELECT SUM("fleet_size") FROM "table_name_4" WHERE "commenced_operations" < 1941 AND "iata" = "pr"