CREATE TABLE "commercial_airlines" (
  "airline" text,
  "icao" text,
  "iata" text,
  "callsign" text,
  "commenced_operations" real,
  "fleet_size" real,
  "headquarters" text
);

Question: Which Airline has a Fleet size larger than 17, and a IATA of pr?
SQL: SELECT "airline" FROM "commercial_airlines" WHERE "fleet_size">17 AND "iata"='pr';

Question: Which ICAO has a Fleet size of 2?
SQL: SELECT "icao" FROM "commercial_airlines" WHERE "fleet_size"=2;

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

Question: Which ICAO has a Commenced operations larger than 2011?
SQL: SELECT "icao" FROM "commercial_airlines" WHERE "commenced_operations">2011;