user: ### NOW ANSWER:
Question: What is the of Fleet size with a IATA of pr, and a Commenced operations smaller than 1941?
Columns: ['Airline', 'ICAO', 'IATA', 'Callsign', 'Commenced operations', 'Fleet size', 'Headquarters']
Types: ['text', 'text', 'text', 'text', 'real', 'real', 'text']
Sample row: ['AirAsia Zest', 'EZD', 'Z2', 'ZEST', 1995.0, 11.0, 'Pasay City']
SQL:

assistant: SELECT SUM("Fleet size") FROM "Table" WHERE "IATA" = 'pr' AND "Commenced operations" < 1941.0;