What is the least passengers from the Dallas/Fort Worth International (DFW) airport?
CREATE TABLE "busiest_domestic_routes_from_lex_april_2" (
  "rank" real,
  "city" text,
  "airport" text,
  "passengers" real,
  "carriers" text
);
SELECT MIN("passengers") FROM "busiest_domestic_routes_from_lex_april_2" WHERE "airport"='dallas/fort worth international (dfw)';