How manu aircraft landings when the cargo tonnes are 18 344?
CREATE TABLE "statistics_for_airport_koltsovo" (
  "year" real,
  "total_passengers" text,
  "passenger_change" text,
  "domestic" text,
  "international_total" text,
  "international_non_cis" text,
  "aircraft_landings" text,
  "cargo_tonnes" text
);
SELECT "aircraft_landings" FROM "statistics_for_airport_koltsovo" WHERE "cargo_tonnes"='18 344';