What was the airport with primary carrier of US Airways with a  2 ranking and more than 51,000 passengers?
CREATE TABLE "top_domestic_destinations_out_of_btv_oct" (
  "rank" real,
  "city" text,
  "airport" text,
  "passengers" real,
  "carriers" text
);
SELECT "airport" FROM "top_domestic_destinations_out_of_btv_oct" WHERE "passengers">'51,000' AND "carriers"='us airways' AND "rank"=2;