CREATE TABLE "passengers_carried_in_2009" (
  "rank" real,
  "airline" text,
  "country" text,
  "passengers_carried" real,
  "remarks" text,
  "alliance" text
);

Question: What is the average rank of gol on airlines?
SQL: SELECT AVG("rank") FROM "passengers_carried_in_2009" WHERE "airline"='gol';