What is the number of 2011 passengers in millions that have traveled a distance of 1271km?
CREATE TABLE "world" (
  "rank" real,
  "city_1" text,
  "city_2" text,
  "2012_passengers_in_millions" real,
  "2011_passengers_in_millions" text,
  "distance" text
);
SELECT "2011_passengers_in_millions" FROM "world" WHERE "distance"='1271km';